Tomorrow, the Board of Supervisors is expected to approve a development tax to help fund the Caltrain/high-speed rail extension to the Transbay Transit Center, but could reduce the rate for developers and slash revenue for the project. You can help ensure this crucial regional transit connection gets completed by telling the supes to stick with the original funding agreement, and not to bow to the Willie Brown-backed developers.

Here are all of this week’s highlights from the Streetsblog calendar:

• Tuesday: Speak at the Board of Supervisors hearing or write your supervisor to help ensure Transbay Transit Center won’t just be a fancy bus terminal. The supes will consider approving the creation of a “Mello-Roos” development tax district, which will charge Transbay District developers a land value-based assessment fee to help fund the Caltrain/HSR extension all the way to the “Grand Central of the West.” Don’t let developers undermine this crucial project and back out of the rates they agreed to. 3 p.m.
• Thursday and Saturday: Bike East Bay is urging Oaklanders to call for continuous, protected bike lanes on Telegraph Avenue. The Alameda Transportation Commission will hold two open houses to collect public feedback on a proposal for partially-protected bike lanes that throw people on bikes into motor traffic on some stretches. Thursday, 6 p.m. to 8 p.m. and Saturday, 10 a.m. to 12 p.m.
• Sunday: Car-free streets on both sides of the Bay: Sunday Streets returns to the Western Addition on Fillmore, Fulton, Baker, and Grove Streets. In Oakland, Oaklavia will grace three miles of streets between the Pergola on Lake Merritt to Latham Square. 11 a.m. to 4 p.m.

Keep an eye on the calendar for updated listings. Got an event we should know about? Drop us a line.