Help - How long after doors until Cavetown actually comes on?

My dumbass bought tickets just before realizing that I'm scheduled to work until 9pm that day. It's the Detroit show on April 24th, doors are at 6:30. Luckily my work is literally 2 minutes away from the venue.

There are 2 opening acts, right? I figure if the first opener starts at 7:30, then Cavetown will come on around 9:30, leaving me time to sneak in. For those that have seen shows on this tour, think I'll make it in time?