NATIONAL WALKING DAY. 9:30 to 11:30 a.m. Check in at 9:30 a.m. Walk begins at 10 a.m. Get up and move. Rockwell Park, Jacob and Muzzy streets, Bristol. Register on-line at www.BristolRec.com. Walk-ins accepted 9 to 9:30 a.m. Weather permitting. No rain date.
THE AMERICAN CLOCK AND WATCH MUSEUM WILL OPEN FOR THE 2016 SEASON. 10 a.m. to 5 p.m. Special activities include clock repair demonstrations in the clock shop and the opening of the exhibit, "Trains, Planes, and Automobiles: Timepieces in the Transportation Industry." American Clock and Watch Museum, 100 Maple St., Bristol. ClockandWatchMuseum.org, (860) 583-6070.
BENEFIT HOLISTIC FAIR. 12 to 4 p.m. Readers, massage, custom jewelry, essential oils, personal care products, natural supplements, more. The Loop, 311 East St., Plainville. Fund raiser for Plainville Food and Pet Shelter.
'ARE YOU JOKING.' 7 p.m. Comedy film shown as part of the 20th Mandell JCC Hartford Jewish Film Festival. Mark Twain House and Museum, 351 Farmington Ave., Hartford. $12 in advance. $15 at the door. HIFF.org, tickets@mandelljcc.org, (860) 231-6316.
BRISTOL CHAMBER OF COMMERCE MEMBERSHIP EVENT. 5 to 7 p.m. Free for all chamber members. Bring a potential new member to introduce to the chamber. Free pizza, free beer tastings, cash bar, door prize. Firefly Hollow Brewing Co., 139 Center St., Bristol. (860)584-4718, info@CentralCTChambers.org. www.CentralCTChambers.org. Space is limited.
'MENDELSSOHN'S ELIJAH.' 2 to 3:30 p.m. A consideration of the composition, the composer, the historical context. Wilde Auditorium, University of Hartford's Mortensen Library, University of Hartford, 200 Bloomfield Ave., West Hartford.