“Pizza Time!” is the name of the inaugural exhibit at Marlborough Broome Street, a new outpost of the gallery. The show will spotlight the work of a group of artists — all of whom have previously used pizza as a canvas. The end goal is to show how pizza is a “signifier of community.” September 8 is opening night for the exhibit, and it runs until October 6. Whatever you do, don’t show up hungry. And if you make that grave mistake, Rubirosa is only a few blocks away.