It's our sworn duty to bring you all the best NYC events every week, but this week we have one nationwide event to share: Join us and the World Wildlife Fund for EarthHour on Saturday to help focus attention on protecting nature. We'll be sitting in the dark, hoping to see some stars.

For the rest of the weekend, the lights are fully ON and all systems are GO. Don't miss the New York Hall of Science's annual Brick Fest Live, the city's ultimate salute to LEGO—this year featuring glow-in-the-dark bricks! Seats are still available for one of the hottest tickets in town, The Lightning Thief: The Percy Jackson Musical, at the Beacon all weekend. And if you're looking for confirmation that spring has arrived, the Prospect Park Carousel is newly open and ready to take kids for a spin or two.

If you're looking for pure entertainment, don't miss PJ Masks Live at Kings Theatre in Brooklyn, The Adventures of Alvin Sputnik at Lincoln Center, Not My Monster at the Flea, The Paper Bag Players at the Jewish Museum, Swan Lake at Lehman College, or The Kids 'N Comedy March show.

If EarthHour inspires you to commune with nature, meet some squirrels at Fort Greene Park, make a rose terrarium at Morris-Jumel, or celebrate Holi, the Indian Color Festival, at the Queens Museum.

Our event calendar is fizzing over the top with more great things to do, and we have carefully curated lists of the Best Spring Events for Toddlers and Preschoolers and the Best Shows for Kids This Spring—catch 'em while you can!