The tem­per­a­ture is starting to drop and the leaves are starting to lose their green color — clear signs that fall is begin­ning. Enjoy this first cool weekend of the year by catching an exhi­bi­tion hockey game, con­fer­ence openers for the soccer teams and a fes­tival ded­i­cated to that staple of many a local pantry, Fluff.

All that jazz: This Sat­urday, six blocks of Columbus Avenue between the Columbus lot and Mass. Ave. will be foot– traffic only — and a lot of those feet will be tap­ping, to the rhythm and swing of the Berklee Bean­Town Jazz Fes­tival, a day­long cel­e­bra­tion of music and one of the city’s largest music fes­ti­vals that starts at noon.

Return to Matthews: Hockey is back at Matthews Arena on Friday night, as the women’s squad faces off against the Ottawa Junior Sen­a­tors in an exhi­bi­tion matchup at 7 p.m.

Con­fer­ence kick­offs: The men’s and women’s soccer teams begin their con­fer­ence sea­sons this weekend with matches against Vir­ginia Com­mon­wealth Uni­ver­sity. The women, whose Veronica Napoli set the career goals and points records with two goals against URI last Friday night, play at Par­sons Field at 6 p.m. Friday. The men’s home game at Par­sons starts at 6 p.m. Sat­urday.

Fluff-​​y fes­tiv­i­ties: The locally revered Fluffer­nutter sand­wich hails right from Somerville, Mass. And this weekend, the region cel­e­brates the gooey white spread with its annual Marsh­mallow Fluff Fes­tival in Union Square, com­plete with cooking con­test, messy com­pe­ti­tions, and per­for­mances by the Fluffer­ettes, the pre­miere (and per­haps only) musical group ded­i­cated to Fluff. The event will be held in Union Square on Sat­urday, Sept. 24 from 3 to 7 p.m.

Big Dog 5K: Northeastern’s annual 5K run along the Esplanade may be sold out with no space for new run­ners, but you can still head down to the Charles River Sat­urday morning to cheer on stu­dents and alumni! Reg­is­tered run­ners can pick up their bib num­bers early by stop­ping by the Alumni Rela­tions office at 716 Columbus Avenue today.Race starts at Hatch Shell at 10 a.m. with reg­is­tra­tion starting at 8:30 a.m.

Tick-​​tock: The Boston art world is buzzing about “The Clock,” the MFA’s new 24-​​hour exhi­bi­tion by artist Chris­tian Mar­clay, who remixed thou­sands of video clips of clocks, watches and time-​​related dia­logue timed pre­cisely to match the clock. Admis­sion to the MFA is free to North­eastern under­grad­u­ates (with stu­dent ID); entry into the 48-​​seat the­ater in the MFA’s new Linde Family Wing for Con­tem­po­rary Art.