It's spring, so there's something green to do every weekend, if not every day. Here are just a few:

BALTIMORE CITY - Roland Park is staging Seven Generations, its second annual weekend-long celebration of sustainability. On Saturday, May 14, there'll be a native plant sale, green expo and garden tour, among other things. Sunday features a "ciclovia" of pedaling, jogging or strolling down Roland Avenue from Northern Parkway to Cold Spring Lane.  Events start around 8 a.m. each day, and last into afternoon. Go here for more.

TOWSON - The Rotary Club of Towsontowne is staging an ECO-fest, a rain barrel and compost bin sale, on Saturday, 8 a.m. to 2 p.m., at Towson United Methodist Church, 501 Hampton Lane.  Looks like it's going to rain, so better get a rain barrel while supplies last.  For more info, go here.

EASTERN SHORE - The 11th annual Great Worcester Herp Search needs volunteers Saturday to help scour the woods and fields for turtles, snakes, frogs and salamanders. Last year, searchers tallied 204 reptiles and amphibians, including box and snapping turtles and five-lined skinks.  The search kicks off 9 a.m. at Furnacetown off Route 12 near Snow Hill with a pre-hunt training session. Pack a lunch, sunscreen and rain gear, of course.  For directions, go here.

(Guiliana Cascio holds a box turtle found near Showell.  Photo courtesy Maryland Coastal Bays Program)