Lake Merritt Weed Warriors. An informal, can-do group of volunteers who work with Public Works Agency staff to weed, mulch, and prune at the parks around Lake Merritt. Gloves and tools provided, but feel free to bring your own. The group meets at various spots around the lake, check the Facebook page for exaction location. 9 a.m. to Noon April 27. Lakeside Park, Lake Merritt, 468 Perkins St., Oakland, https://www.facebook.com/LakeMerrittWeedWarriors.

Earth Day eWaste Drive & Warehouse Sale. Recycle old electronic waste for free at the first St. Vincent de Paul of Alameda County Earth Day Event. Donations over 3 pounds receive a free mini lunch. Hard drive destruction service available for $3. Warehouse open to shoppers. 10 a.m. to 3 p.m. April 27. St. Vincent de Paul of Alameda County, 9235 San Leandro St., Oakland. Free. 510-638-7600, www.svdp-alameda.org.

Oakland Veg Week Grand Finale Celebration. Join fellow Oakland Veg Week pledgees to celebrate a week of healthy and humane eating at the Veg Week celebration party, and enjoy delicious plant-strong foods and samples from vegetarian businesses, and chat with Oakland Veg Week organizers about vegetarian eating. 1 to 3 p.m. April 28. Lake Merritt Sailboat House, 568 Bellevue Ave., Oakland. Free, oaklandveg.com/events.

Jack's Night Market. An evening filled with merriment and verve -- held in conjunction with Oakland's First Fridays -- Jack's Night Market on the waterfront is an outdoor bazaar featuring an eclectic mix of artisans, music, food and fun. 6 to 10 p.m. May 3. Jack London Square Pavilion Plaza & Stage, Broadway and Water St., Oakland. Free. 510-645-9292, www.jacklondonsquare.com.