Let's Go to the Rat! And Celebrating 'I Have a Dream' in Boston

1) Let's Go to the Rat! Documentary Film Benefit Concert
This benefit concert will feature performers that played The Rathskeller, a famous Kenmore Square venue that hosted bands like the Police, the Ramones the Talking Heads and the Pixies in the 1970s, '80s and '90s. Tonight's concert, at Johnny D's, benefits a film about "the Rat," as the venue was known. It begins at 7:30 p.m.

2) "I Have a Dream" 50th Anniversary Concert
Head to the Hatch Shell in Boston today to celebrate the 50th anniversary of Martin Luther King's "I Have a Dream" speech. It starts at 7 p.m.

3) Crowdfunding East Conference
Speakers at this conference include founders of crowd-funding platforms, investors, lawyers, and entrepreneurs who have used crowd-funding to raise money. It's at 9 a.m. at the Harvard Faculty Club, 20 Quincy St., Cambridge.

4) Accessibility Meeting
If you missed it, there's a meeting tonight about accessibility and ADA compliance in Somerville. The meeting is at 6 p.m. at City Hall.

5) Weather
A chance of thunderstorms with a high around 81.