two Bloomingdale AlleyPalooza locations: 136 Randolph Pl NW and 131 Adams St NW

Here is the link to the DDOT PDF that lists the alleys throughout the District participating in the Mayor's recently announced AlleyPalooza.

And here is a FAQ.

Thanks to Bloomingdame for supplying the links.

Here are the Ward 5 alley locations:

Note that there are two Bloomingdale alleys.