The Empty Bottle has been offering free admission to a lot of shows lately — as long as you RSVP by midnight the night before. It’s a great deal, and it seems to be opening the door for concerts by some fledgling bands. One such Chicago band is Super Minotaur, who headlined March 20 … unfortunately, to a pretty small crowd, in spite of the free admission. Super Minotaur was celebrating the release of its cassette, Dead Dino, and playing fast, ragged punk pop. The trio has a couple of cool songs, “Phantom Brat” and “Trip,” streaming on bandcamp. If Super Minotaur keeps building on the potential of those songs, it should be drawing bigger crowds in the future.