Saturday Easter egg hunts, including from 9 to 11:30 a.m. at Brooklyn Boulders Somerville, 12 Tyler St., near Union Square, Somerville; at 10 a.m. at Nathan Tufts/Powderhouse Park, College Avenue and Broadway, Somerville; from 10 a.m. to noon at North Point Park, 1 North Point Blvd., NorthPoint; and from 11 a.m. to 12:30 p.m. at Dana Park, 74 Magazine St., Cambridgeport.

At the Brooklyn Boulders event, kids are broken up unto four teams to scour the facility for hundreds of Easter eggs, with the team that finds the most eggs in two hours winning. A $10 pre-booking includes a tote and a youth day pass to enjoy the facility afterward. There is no church associated with this event in its promotional materials.

The Powderhouse Park event is sponsored by Christ the King Presbyterian Church in Somerville. Eggs and nut-free candy will be provided, but families but bring their own basket.

The North Point Park event is the fourth annual such Easter Eggstravaganza held by the Aletheia Church, and it includes age-appropriate games; egg hunts; prizes and face painting; and fun music. Aletheia describes itself as a Gospel-centered church that holds services at the Central Square YMCA.

The Dana Park event is sponsored by Journey Church, which meets in Harvard Square and espouses core beliefs that include baptism. Its Easter event registration and games start at 10:15 a.m. and include a bounce house, egg hunt, games, face painting, music and prizes. More event information and pre-registration is here.

Luminarium’s Dance + Series, from 10 to 11:30 a.m. Saturday at The Center for Arts at the Armory, 191 Highland Ave., Somerville. Free.

This family-friendly class run by the Luminarium Dance troupe meets each Saturday in April to explore themes of dance intersecting with other fields including technology, science, music and light. It is open to all ages. Event information is here.

Science Carnival & Robot Zoo from noon to 4 p.m. Saturday at the Cambridge Main Library, 449 Broadway. Free.

This event is part of the just-started, 10-day Cambridge Science Festival and aims to let participants see, touch, smell, hear, and taste science in new and exciting ways among five themes: Earth & Space (to explore flight, electricity, physics, optics, the ocean, the history of the earth, the flora and fauna of the planet and how we are jumping off into space); Micro-Zone (to look at research in microbiology, health and chemistry, including how elements interact and how we discover cures for diseases); No Limits (hands-on activities that cross the boundaries of scientific disciplines, ending with liquid nitrogen ice cream and a photo at the science rocks photo booth); Game Corner (to expand ideas of what it means to be a gamer by playing, programming and learning how games are made, testing wits against one of the greatest gamers of all time –  “Watson,” the IBM computer featured on “Jeopardy” – and learning how humans learn and how our brains work); and the Robot Zoo (back for its second year, this exhibit explores robotics technology and activities from organizations throughout Massachusetts, the United States and the world).

A bonus performance of “Marvelous Molecules in Play” by the MIT Chemistry Department & MIT Alumni Association/Club of Boston is included. There are two shows, at 12:30 and 2 p.m., each lasting about an hour, that will hold entertaining and inspirational science demonstrations geared toward middle-school-aged children. Experiments and demonstrations might include the combustion of elements, a smoking chemical transformation, hot potato carbon dioxide balloons, a colorful chemical reaction and playing with liquid oxygen.

Event information is here.

Down Home Up Here Bluegrass Festival starting at 4 p.m. Saturday and 5 p.m. Sunday at Passim, 47 Palmer St., Harvard Square. Tickets for performances are $15 per day, or $10 a day for Passim members.

Club Passim’s very own bluegrass festival includes seven bands and performances Saturday (as well as four workshops on banjo, fiddle and guitar) and another six on Saturday. For a complete schedule, look here for Saturday and here for Sunday.

Dhoom, the Bollywood Dance Night, from 8 to 11 p.m. Saturday at the Massachusetts Institute of Technology’s Stratton Student Center, 84 Massachusetts Ave. Tickets are $5 at the door for general admission (or $2 at the door for members of the MIT community and free if signed up here).

Sangam, the association of Indian students at MIT, holds its Bollywood Dance Night, Dhoom, and invites people to dress in bright spring colors and stop in to “groove to super-hit Bollywood numbers” spun by a DJ. There will be prizes, Indian snacks and drinks. Event information is here.