This weekend is Ballads and Brews, the maritime music festival which is normally a part of the Bay City Tall Ships Celebration. Even though this is an off year for the tall ships, they’ve decided to go ahead with the music.
This year will have Celtic Jams hosted by Hoolie, Roane, La Compagine, and (if it’s your sort of thing) Enter the Haggis.
There’s a nice article from Mlive with what I believe is the correct schedule (the one on the official Ballads and Brews page appears to be preliminary).