How many Mayfests does Chicago really need? Apparently there's room for one more, which differentiates itself from the rest by occurring on the riverfront. Attendees can look forward to music from Weezer and Sublime cover bands as well as original tunes by the Casey Donahew Band. Of course, it wouldn't be a party without the requisite food and booze. Hey, it's May, you have to celebrate it while you can.