From event page on FaceBook:

Every Second Sunday
5:30PM-Dark for the months of Aug/Sept/Oct
Free and open to the public
Visual artists come to plein air!
Performers come improv!

Second Sundays Twilight Zone is an event to encourage collaboration/experimentation or just to have some company and chat while producing art in the park.

No registration required. Just show up and have fun!
We encourage spontaneous collaboration and experimentation

Note: Given the ongoing controversy and conflict over Monroe Park’s “renovation”, its not surprising that this newly-announced event series has lead to some interesting debate over the role of art.