Cause to celebrate

You’ll watch a “free-form, collaborative style’’ in action at tonight’s “We Do’’ GLAD Benefit. According to the event organizer, Boston singer-songwriter Alastair Moock (above), this approach gets musicians to move outside their comfort zones and try new material by collaborating and improvising with other musicians. You can enjoy the music from your comfort zone and help raise money for Gay & Lesbian Advocates & Defenders’ New England Marriage Equality Campaign. Performers include Moock, Melissa Ferrick, and Tracy Grammer. 7 p.m. $20. Reservations recommended. Club Passim, 47 Palmer St., Harvard Square, Cambridge. 617-492-7679. www.clubpassim.org