Science and art collide at the MIT Museum, which showcases 80 rare freehand drawings by Santiago Ramon y Cajal (plus contemporary renderings from MIT labs) in The Beautiful Brain. The trailblazing Spanish neuroscientist (1852–1934) won a Nobel Prize in 1906 for his research on the brain and nervous system. Through December 31. Adults $10, youth and seniors $5. mitmuseum.mit.edu
Fife Goes On
Jump into the Lexington Tattoo and Muster by marching the kids to the Battle Green to hear four fife-and-drum corps play 18th-century selections on Friday at 7 p.m. The event continues on Saturday at Minute Man National Historical Park, with a parade at noon and performances by more than two dozen uniformed corps from around the country. Both events are free. williamdiamondjrs.org
Join Pugs Take Boston for an eye-popping weekend of curly tails galore. Head to the Boston Common Carousel, near the Frog Pond, on Saturday from 10 a.m. to noon and meet the pugs of Greater Boston (free). Pug owners and their furry friends can support Pug Rescue of New England at dog-friendly activities including a Freedom Trail tour, two parties, and a Boston Harbor cruise. Ticket prices vary. pugtakeovers.com
From musical to drama to comedy, sample the work of 50 New England playwrights at the Boston Theater Marathon, organized by the Boston Playwrights' Theatre. A series of 10-minute performances kicks off at noon at the Boston Center for the Arts' Calderwood Pavilion. Audience members are welcome at the afterparty. Tickets $35, $25 in advance. bu.edu/bpt
Seis de Mayo
"Cinco de Mayo Plus 1" is the theme of the 35th annual Harvard Square MayFair. Join tens of thousands of revelers for a seasonal celebration with a Mexican twist. Mariachi bands and Mexican food highlight the event, which also includes art vendors, street performers, and family activities. Noon to 6 p.m. Free. harvardsquare.com
Share your event news. Send information on Boston-area happenings at least three weeks in advance to firstname.lastname@example.org. Follow us on Twitter@BostonGlobeMag.