As we reckon with summer’s departure, there are a variety of fun-filled events to welcome the first signs of fall. Visit two “carnivals,” each with its own twist: huzzah and hurrah with medieval jest at the Brighton Bazaar’s Knight Carnival or tinker and test interactive exhibits at the Cambridge Science Carnival. Also, Somerville celebrates its prized, local invention, Marshmallow Fluff, with the 20th annual Fluff Festival, complete with sticky games and extra sugary challenges.

Here are six no-cost activities and events for the week of Sept. 15-21, as well as two ways to save on the arts this season.

BOOK LOVERS UNITE If a book club had a silent disco equivalent, it might be the Boston Figurative Art Center’s BYOBook event. Unlike a traditional book club, everyone brings whatever book they’re currently reading to a guided discussion with fellow readers from 7-7:30 p.m. After, attendees are welcomed to read as they please on the studio’s couches or lounge area. Snacks and beverages from the studio will be available. Sept. 17, 7-9 p.m. Boston Figurative Art Center, 285 Washington St., Somerville. bostonfac.com

KNIGHT MARKET The Brighton Bazaar, in collaboration with roving merchant curators Medieval Merriment, will transform into the first-ever Knight Carnival for a night of Middle Ages-themed mischief. Immerse yourself in a live sword fight between armored knights from local melee club North Horde, a creature puppet show, fantasy-inspired musicians, a site-wide scavenger hunt, and a costume contest for attendees dressed in their Ren Faire best. If you have gold in your inventory to spend, vendors will be selling trinkets all night. Sept. 18, 5-10 p.m. Charles River Speedway, 525 Western Ave., Brighton. facebook.com/thebrightonbazaar

AUTUMN LEAVES The Boston Landing Fall Crawl celebrates the arrival of the season with a reptile show with snakes and lizards, pony rides, and pumpkin decorating. DJ Dukes will play a live set from 11 a.m.-2 p.m., and country singer Louis Bello will pick up from 2-4 p.m. Meanwhile, from noon-2 p.m., attendees can join a line dancing lesson. Churros are on the house (while supplies last), and barbecue eats and other Southern staples will be available for purchase. Sept. 20, 11 a.m.-4 p.m. Boston Landing, 92 Guest St. bostonlanding.co

MARSHMALLOW MADNESS Don’t expect to come out of this one clean: Somerville, the birthplace of Marshmallow Fluff, celebrates this sticky-sweet legacy with the 20th annual Fluff Festival. In addition to live music and entertainment, the event will host unique games for prizes, including Fluff jousting, where participants use pool noodles with Fluff to knock others off a balance beam, and a Fluff hair-styling contest, where Fluff and Teddy peanut butter are provided for contestants to style the best ’do. .Attendees who arrive by cycle can access two free bike valets — one in front of Gracie’s Ice Cream and another by the intersection of Somerville Avenue and School Street. The fest is free to attend, but marshmallow-y foods and drinks will be available for purchase. Sept. 20, 2-6 p.m. 366 Somerville Ave., Somerville. flufffestival.com

UP, UP, AND AWAY The City of Quincy celebrates its 400th birthday with a Hot Air Balloon and Laser Light Show at Merrymount Park. On Pageant Field, attendees can play lawn games or journey 60 feet in the air in tethered hot air balloons. Meanwhile, roving costumed performers and food trucks can be found on Adams Field. At 9 p.m., the laser show begins, projecting streams and beams onto the overhead balloons and trees. Sept. 20, 4-10 p.m. Merrymount Park, Quincy. Reserve free balloon ride vouchers on the event’s website. quincy400.com

SCIENTIFIC WONDERS More than 150 booths showcasing STEAM’s finest (and most fun) will occupy the 17th annual Cambridge Science Carnival. Visit a robot petting zoo — featuring robots of the underwater, basketball, and gummy bear varieties — check out hands-on booths to make stomp rockets, sugar glass, or bath bombs. Members of the MIT Physics Department will perform demonstrations at 1 and 3:15 p.m., and the hosts of the “Tumble Science” children’s podcast will perform interactive songs at 1:45 p.m. Sept. 21, noon-4 p.m. Kendall/MIT Open Space, 292 Main St., Cambridge. cambridgesciencecarnival.org

Deals and Steals

FINE FOR FIVE Starting Sept. 18, the Museum of Fine Arts kicks off its $5 Third Thursdays programming. On the third Thursday of each month, from 5-10 p.m., general admission is pay-as-you-wish with a $5 minimum. A crisp Lincoln grants access to the main galleries, as well as special after dark programming exclusive to each event — this month is Latinx Heritage Night featuring drop-in art sessions to make Puerto Rican beaded bracelets and Ex-Votos paintings, live sets by the Rafa Moreno Band and DJ Montro, and special spotlight talks and guided tours. mfa.org

SYMPHONY SEASON PASS Full-time Boston students with a valid college ID can take study breaks with an (award-winning) symphony when they purchase a $20 H+H Masterpass. The exclusive pass can be redeemed to access up to eight Handel and Haydn Society performances through the 2025-26 season. (Some exclusions apply.) handelandhaydn.org/concerts-tickets/masterpass

Check individual event websites for the most up-to-date information.

Send info on free events and special offers at least 10 days in advance to ryan.yau@globe.com.

Ryan Yau can be reached at ryan.yau@globe.com.

Walker Buehler’s Red Sox tenure came to an unceremonious end on August 29 when he was released to clear a roster spot for top prospect Payton Tolle to make his major league debut. His Phillies tenure, however, got off to a pretty good start Friday night.

Buehler, who signed a minor league deal with Philadelphia within a couple days of Boston cutting him, got the start at Citizens Bank Park against the Royals and delivered, holding Kansas City to one run on five hits while striking out three batters and walking just one in five innings. Philadelphia, won, 8-2, and Buehler got the win, marking his first such result since August 8, when he turned in one of his best performances in a Red Sox uniform and tossed six shutout innings in San Diego.

For Buehler, who owned a 5.45 ERA in 112 ⅓ innings for Boston, it was the third outing since July 1 in which he didn’t issue multiple walks. In 23 games (22 starts) for Boston, he issued free passes at a rate of 4.4 per nine innings. He also allowed 22 home runs.

The Phillies added Buehler to the mix in an effort to give their top starters — Cristopher Sánchez, Ranger Suárez, Jesús Luzardo and Aaron Nola — some extra chances to rest down the stretch. For now, he’s slotting into Philadelphia’s rotation as a sixth option, but he could serve a bullpen role come October if he’s pitching well and manager Rob Thomson wants to try to tap into the playoff magic Buehler has provided throughout his career. The 31-year-old, who recorded the final out of the World Series last fall at Yankee Stadium, has a career 3.04 postseason ERA in 19 appearances and has pitched three times in the World Series.

“He fits right into that mold of being a Philadelphia baseball player,” Buehler’s new teammate, Bryce Harper said, according to The Athletic’s Matt Gelb. “Just a lot of fun to be around him. Obviously, he’s pitched in big moments, deep into the postseason. So getting a guy like that in our clubhouse is huge for us. And he went out there and did a great job tonight.”

In Bill O’Brien’s first year at Boston College, the Eagles finished with the second-most rushing attempts and fewest passing attempts in the Atlantic Coast Conference.

Through two games in 2025, BC is 12th in rushes and 16th in yards per rush, compared with second in passes and first in completions and completion percentage.

The benefits of a pass-heavy attack are obvious, as the Eagles are leaning on a steady diet of Dylan Lonergan darts and moving the ball with fluidity. The next step is finding the sweet spot, where the run game complements the passing game and makes BC multidimensional and even more potent.

“We strive for balance, but we also do what we believe it takes to win the game,” O’Brien said. “In the last game, we had to throw the football to move the ball, but the running game has to improve. We go into every game wanting to be 50/50.”

The Eagles (1-1) will have an opportunity to find consistency in that area when they face Stanford on Saturday at 10:30 p.m. Eastern. Yes, it’s an ACC matchup 3,122 miles across the country that will likely end at close to 2 a.m. back home.

O’Brien isn’t sure of the last time he stayed up that late, but he acknowledged it’s been a long time.

BC’s players embrace the challenge and are eager to start conference play convincingly against the Cardinal (0-2).

Here are three keys to victory for Boston College:

⋅ Lonergan to Lewis. While it’s important to not become one-dimensional, that doesn’t mean the Eagles should veer away from what’s working.

Lonergan is the second ACC quarterback this century to post eight-plus touchdown passes and no interceptions in the first two games of a season. O’Brien is largely pleased with what he’s seeing, but he made sure to put the scorching start into perspective.

“It’s only two games,” O’Brien said. “We’re not sending him quite yet to the BC Varsity Club Hall of Fame. We’re not sending him to Canton just yet. But he’s off to a good start. We’re thrilled that we have him.”

Twenty-two of Lonergan’s 60 completions have gone to star receiver Lewis Bond, who leads the nation in receptions.

Bond is a master route runner who has a knack for creating separation in tight windows. He has 147 career catches, putting him on track to eclipse Zay Flowers’s school record of 200.

“Give a lot of credit to Lewis Bond,” O’Brien said. “He’s one of the best players to ever play at Boston College, no doubt about it.”

⋅ Goin’ to Owen. Senior captain Owen McGowan, a Canton native and Catholic Memorial product, has excelled in an increased role.

O’Brien credited McGowan for keeping the Eagles in last Saturday’s double-overtime loss to Michigan State. His sack of Aidan Chiles gave BC a chance, and he added eight tackles.

“If you’re not physical, you’re not going to make them,” McGowan said. “You have to have the mind-set that you’re not going to miss tackles.”

The Eagles are well aware that they missed some tackles they should have made against Chiles and Co.

BC’s top three tacklers this season are defensive backs, which is a double-edged sword that illuminates a strength and a weakness.

“We do have to tackle better,” linebacker Daveon Crouch said. “So we obviously incorporated that a lot into our practice this week.”

Stanford quarterback Ben Gulbranson has completed just 51.6 percent of his passes and thrown three interceptions, but the Eagles know that doesn’t mean they can sleep on him or a potential replacement.

Putting pressure on the quarterback, and creating chaos defensively, could go a long way in ensuring BC takes care of business.

⋅ Put it in the past. The Eagles started last season 4-1, before dropping three straight in an uninspiring stretch against Virginia, Virginia Tech, and Louisville.

The loss to the Spartans was just one game, but BC needs to ensure it doesn’t spiral into more. Right tackle Kevin Cline said the Eagles are focusing on converting the feeling of losing into fuel and expelling the emotion they have through each rep.

“Win or lose, it’s coming,” Cline said. “Next week is coming. You’ve got no time to sulk in it or glorify yourself in it. You’ve got to keep moving, keep your head down, keep being persistent.”

BC enters as a 13½-point favorite, which is rare for the program on the road in conference play. O’Brien said he believes the Eagles “can be a good football team,” but they have to “go do it.”

It’s up to BC’s players to rise to the occasion and not let a winnable game slip away.

“Not a lot of us have been out West, so it will be a fun trip,” said wide receiver Luke McLaughlin. “I think we’re all excited to get the ACC games going.”

Trevor Hass is a sports producer for Boston.com, where he writes and edits stories about Boston’s professional teams, among other tasks.