I think that's a regular summer occurrence. At least I saw something about it last summer. Cool photo though. Thanks for the link, mousepod!
The
Neue Galerie has caberet at their Cafe Sabarsky in the fall. You should check it out GD. There's an email list to join for info. Even if you don't get to the caberet, I would recommend the cafe. It's got great food and the decor is in a Viennes coffehouse style with some great deco light fixtures.
Here are some pictures I took.