i would say that the avam is probably 15 minutes away from the mojo... mapquest would give you a more accurate time. would depend on if there is a backup at the tunnel if you take 95 verses driving through the city.
i seriously doubt the high strung would be on before 10pm more like 11pm... like most small rock and roll clubs things start late on a friday night. my speculation is first band on at 9:30
your friend in long live death would probably know the schedule better