May 18 and 19 (Saturday and Sunday), 8am: Two birdwalks to see/hear warblers and other birds at the Institute Woods and Rogers Refuge. More info at this link.
Healthy Children, Healthy Planet, a fundraiser for the school garden program, today, Saturday, 10-2 at Riverside Elementary. More info here.
Marquand Park Cleanup, Sunday, May 19, noon to 4pm. Good opportunity to get familiar with this park and arboretum, and meet the volunteers who help take care of it. A writeup on the park at this link.