April 23 Earth Day Omaha Elmwood Park, 11 a.m.-6 p.m. FREE, earthdayomaha.com Back in the day Earth Day celebrations were punctuated with eco-crusading hippies, hackeysacking in Birkenstocks and swathed in patchouli. But, as the Earth itself continues to warm, sustainability too has become an ever-hotter mainstream topic. This year’s Earth Day Omaha celebration features earth-friendly demos, speakers and family activities, a beer garden, food from local vendors and more, including live music from Matt Cox, Platte River Rain, The Answer Team, Brad Hoshaw & the 7 Deadlies and the most recent addition, Satchel Grande. Plus, from 11 a.m.-3 p.m. Recycling Central offers free electronics recycling; the only exceptions are TVs and monitors, which they’ll still take for a small fee.