Saturday at 4, They Might Be Giants perform a free concert at the Prospect Park Bandshell for a $3 donation, as part of Celebrate Brooklyn. Info, here.

Also on Saturday, the Kris Waldherr Studio-Gallery (this woman is amazing), is hosting an opening for the show, Brooklyn: Through a Child’s Eyes,” featuring the illustrations of 21 kids ages 3 to 9, who created the work in a single afternoon recently. There’s a book, too. Noon to 3, 1501 Newkirk Ave. (entrance on Marlborough Road, around the corner from subway station), 347-406-5811.

If you’re hitting the road or the skies this summer, plan now for a bon voyage at Flight 001′s sample sale Saturday and Sunday at their Smith St. location (132 Smith St.). The travel store, whose online product menu includes everything from aerotherapy to “jet comfort,”  is celebrating Bastille Day and selling “one of a kind” samples, cds and an assortment of bags. There’s also a packing-themed raffle.

Or brings the kids to the Brooklyn Children’s Museum (145 Brooklyn Ave. at St. Marks Ave.) tonight at 5 for the first of the Target Free Friday Family Jams. Ugandan music and dance will be featured tonight, with some film shorts and African Pearl Troupe leading a drum session (bring your own drum to join in), 5-7:30; admission free after 5. Then come back for the museum’s Sportacular Weekend (Saturday and Sunday), where the family can learn about world sports, fitness and nutrition and the athletes of the animal world (maybe even some aquatic?) through two all-day schedules of demonstrations, activities, lessons and music. 11:30 to 5, both days.

Red Shed Community Garden (266 Skillman Ave. at Kingsland Ave.) in Williamsburg is holding a mega BBQ/benefit on Saturday, with $2 hot dogs, $3 burgers and sausages, free salads and sides, a raffle for dinners and services, a book swap and, oh, yeah, you get to see the workings of an urban organic garden. 1-6 p.m.

Sunday brings the kickoff the Jelly NYC Pool Parties at their new home in East River State Park (no pool here, but there’s some water nearby, so they kept the name). Still, there’ll be DODGEBALL, basketball, food and of course the DJs and bands. Sunday’s line up includes Mission of Burma, F***ed Up, Ponytail and Jemina Pearl. Gates open at 2 p.m., 90 Kent Ave. at N. 9th St.