Photo by DDOTDC on Flickr.

This week, celebrate the new 11th Street bridge, learn how DC could become the nation’s cycling capital, Metro’s plans to run buses all night, and how to live a greener life at events all around Greater Washington.

New 11th Street Bridge: On Saturday, Mayor Gray and DC officials will dedicate the bridge with a festival from 12-3pm on the local span featuring music, performances, and food trucks. Click here for more information.

Talk about bikes in Arlington: Dr. Ralph Buehler, professor and author of City Cycling, will talk about ways to promote biking with Shane Farthing of WABA, Arlington County board member Chris Zimmerman, and our own Jaime Fearer. The event will be on Thursday, September 12 at 6:30pm at the Virginia Tech Research Center, 900 N. Glebe Road in Arlington. Visit their website for info or to RSVP.

After the jump: Learn about the Purple Line in Bethesda and how Montgomery County’s demographics are changing. And if you have any events for future roundups, email me at events@ggwash.org.

Could Metrobus run all night?: Next week, the Action Committee for Transit hosts Jim Hamre, head of bus planning for WMATA, who’ll talk about plans to increase late-night bus service. That meeting will be at 7:30pm on Tuesday at the Silver Spring Civic Building, One Veterans Place in downtown Silver Spring. For more information, visit their website.

Green Living Expo DC: Over 40 exhibitors, workshops, and eco-tours will offer information on bike lanes, home energy-saving resources and government grants, green roofs, urban forests, and more. The event will take place at the University of DC’s Dennard Plaza on Saturday, September 7th from 10 am to 4 pm. Visit greenlivingdc.org for more info.

Going Purple in Bethesda: Montgomery County planners are exploring potential design options for routing the Purple Line and the Capital Crescent Trail near Wisconsin Avenue and want public input. The event will take place at the Bethesda Regional Services Center, 4805 Edgemoor Lane on Saturday, September 7th beginning at 10 am. Find out more information at the Planning Department’s website.

Discuss Montgomery County’s future: The Committee for Montgomery will host a forum on the county’s rapidly changing demographics featuring Metro’s head planner Shyam Kannan and Gwen Wright, director of planning at the Montgomery County Planning Department. The discussion will happen on Monday, September 9 at 8am at Building 1 of the Universities at Shady Grove in Rockville. For more information or to RSVP, visit their website.