Photo by The City Project on Flickr.

This week, celebrate spring by helping clean up the Anacostia River and learning about trees in urban environments. You can also talk about bicycling in Montgomery County, bus technology, and safer streets in DC.

Clean up the Anacostia: On Saturday, April 5, the Anacostia Watershed Society is organizing clean-up events in DC, Montgomery, and Prince George’s. Organizers will talk to volunteers about the river and its watershed, and then volunteers will help remove trash from neighborhoods, streams, and the river.

The cleanup activities run from 9 am to noon at 20 sites Volunteers of all ages are welcome. You can register here. At noon, join other volunteers at RFK Stadium for free food, drink, music, and speakers for a post-cleanup celebration.

Montgomery County bicycle summit: Discuss the future of biking in Montgomery County at a bicycle summit on Saturday, April 5. The summit includes a family bike ride, presentations from local bike groups and the Montgomery County DOT, and a panel discussion. It will be at the Jane Lawton Recreation Center (4301 Willow Lane) in Chevy Chase from 9:15 am to noon.

Bus hack night: On Thursday, April 3, find out if data visualizations can make buses sexy (hint: ART and WMATA think so). Speakers from WMATA, ART, and Conveyal, a consulting group, will talk about ways to use data from bus GPS devices to improve service. ART and WMATA have provided data to discuss at this event.

The discussion will run from 6:00 to 8:30 pm at the Mobility Lab, 1501 Wilson Boulevard, Suite 1100, Arlington. You can RSVP here.

Florida Ave transit study: DDOT is holding a public meeting on Wednesday, April 2 to discuss the Florida Avenue Multimodal Transportation Study. This study is evaluating traffic safety, streetscape enhancements, and operational improvements for the section of Florida Ave NE from New York Ave to H Street and Benning Road and surrounding roads.

Tony Goodman has written about the options DDOT will present at the meeting, which will take place at the Two Rivers Public Charter Middle School (1234 4th Street NE) from 7:00 to 9:00 pm.

Learn about urban arboreta: Nate Heavers, Assistant Professor of Landscape Architecture at Virginia Tech, and Ray Mims, of the US Botanic Garden and Sustainable Sites Initiative, will give a presentation on the history of planting trees in public spaces in DC and Alexandria.

After the talk there will be a Q&A session and a reception. This free event takes place on Tuesday, April 1 from 7:00 to 9:30 pm at 1021 Prince Street in Alexandria. You can RSVP by emailing udseminar@vt.edu.

Who hears opinions on public projects?: Many of you share your thoughts on public projects on social media, but that doesn’t mean agencies making decisions see it. The National Capital Planning Commission is having a panel discussion about how public agencies handle official versus unofficial feedback and resident input that comes in using newer technology.

NCPC’s William Herbig will moderate a conversation with Greater Greater Washington’s David Alpert, Cheryl Cort of the Coalition for Smarter Growth, Don Edwards from Justice and Sustainability Associates, and NBC4 reporter Tom Sherwood. The event is Wednesday, April 9, 7:00-8:30 pm at NCPC, 401 9th St NW, Suite 500.