She-Devils and Mini Dresses with Beautiful Woman from 10 p.m. to midnight Friday at Lilypad, 1353 Cambridge St., Inman Square. Cover is $10.

Disappear into a sweet retro fog with She-Devils and Mini Dresses. She-Devils, a Montreal duo still fresh from South by Southwest, evoke surf guitar, a girl band sound and a slightly psychedelic swirl of samples that you’ll likely want to dance to – do the swim, maybe – before shifting ever so slightly (and possibly frustratingly, but judge for yourself) into a dissonance that feels like their lyrics are coming out one headphone and the tunes from another. But you’ll be sorry for not catching the sweet “Come,” sultry “Hey Boy” and deliciously menacing “Make You Pay” live. Mini Dresses, a dreamy pop band from Boston, gives a sleepier, darker and sexier overall vibe, and Beautiful Woman livens up the bill with a hefty dose of snark – the kind that feels like best friends recorded it at a sleepover after sneaking too much from the folks’ liquor cabinet while Courtney Barnett plays on infinite loop. Information is here.

Ninth Dance for World Community Festival from noon to 8 p.m. Saturday at Jose Mateo Ballet Theatre, 1151 Massachusetts Ave., Harvard Square. Free.

The Jose Mateo Ballet Theatre’s indoor-outdoor festival encompasses more than 90 performances in pretty much every dance style imaginable from noon to 6 p.m. (introductory classes are thrown in) and an “Advocacy Way” stretch of tables staffed by local nonprofits eager to share their messages. The final two hours of the event becomes a parking lot dance party. Information is here.

Ninth Annual Beer Pong for a Cure from promptly at 6 to 10 p.m. Saturday at the Dante Club, 3 Dante Terrace off Craigie Street, in the Spring Hill neighborhood near Porter Square in Somerville. Competing is a $30 minimum donation, with pre-registration strongly encouraged.

There are many who might consider this the best way to help cure cancer – though this “Beirut” style tournament for two-player teams requires no drinking (the “beer” is optional, per World Series of Beer Pong Rules). There’s complimentary food and cash bar, raffle prizes and silent auction items, with proceeds going to support cancer treatment and research at the Jimmy Fund/Dana-Farber Cancer Institute through the Pan-Mass Challenge. The winners go home with prizes, a sense of accomplishment and possibly a slight buzz, depending how seriously they take the “beer” part of “beer pong.” (Pre-registered teams will play in a double-elimination tournament; arrivals at the door will play in a single-elimination tournament. But no beer pong experience is necessary for either.) Information is here.

38th Annual Boston Dragon Boat Festival from 7 a.m. to 5 p.m. Sunday around the Weeks Footbridge, 948 Memorial Drive, in the Riverside neighborhood. Free.

Nearly 20,000 spectators gather each year to watch up to 40 teams from the United States and Canada compete in a 500-meter race in sleek, colorful 39-foot-Hong Kong-style dragon boats and take advantage of Asian cultural performances, food and arts and crafts. (Preliminary time trials for the teams take place 7 a.m. to 2 p.m. Saturday on the river.) Started in 1979, this is the oldest such festival in North America. Information is here and the event schedule is here.

11th Annual Family Music Festival from noon to 3 p.m. Sunday at the New School of Music, 25 Lowell St., West Cambridge. Free.

Family picnic games, face-painting, crafts, a bake sale, concerts and a musical instrument “petting zoo” fill the Lowell School Park, with students and faculty performing throughout, including a 12:30 p.m. student recital, 1:30 p.m. choir concert (inside) and 2:15 p.m. faculty performance. Information is here.