From SOSNA's event page:

Plazapalooza is back for it’s 10th year! Join us on May 11 for live music, food trucks, beer, and even a designated Kid’s Corner with activities, games, and more. This year will mark the six year anniversary of the Triangles Plaza, as well as the start of summer at The Triangles with concerts, birthday parties, and countless hours of enjoyment for the young and old who visit the plaza to meet with friends, read a book, or just lounge in the shade by the Catharine Thorn Fountain.

Find out more about Plazapalooza and RSVP here.