I'm in the Detroit area, which has a lot of good venues. The closest to home is an 1,100-capacity place called The Crofoot. The Crofoot also features a 150-person club within it called The Pike Room. The whole shebang's about 7 or 8 blocks from my home.
As for the metro area as a whole, the area's in a bit of a state of flux right now. The biggest stadium where concerts were held (the ol' Pontiac Silverdome) got demolished and we've lost no less than 3 arenas (12,190-seat Cobo Arena, 19,000-seat Joe Louis Arena and the 22,100-seat Palace Of Auburn Hills) in the last 8 or 9 years. The three of them have been replaced with 1 new arena (Little Caesars Arena) which is actually a couple hundred seats smaller than Joe Louis was. Of the two downtown stadiums, 65,000-seat Ford Field actually seems to host more shows per year than its next door neighbor, the 38,400-seat Comerica Park. Then again FF's got a roof, so...
As far as outdoor amphitheaters, we have 4 major ones: DTE Energy Music Theater, Meadowbrook, Michigan Lottery Amphitheater, and the Aretha (formerly Chene Park) on Detroit's riverfront. They hold 15,500, 7,000, 7,000 (yeah, that's two 7,000-seat venues not even 12 miles apart, smdh), and 4,000 respectively. The 5,500-capacity Phoenix Amphitheater, located a block away from The Crofoot, might be reopening this year. I was personally hoping that a new larger shed in the 20-30k range would get built on either the old Tiger Stadium site, West Riverfront Park, or the former State Fairgrounds location, but none of that's gonna happen. Too bad, as there's absolutely no room for any further expansion of DTE.
The Club/theater scene is booming, though, with several new spots opening in the last few years. Even Harpo's, Detroit's infamous heavy metal hellhole where U2 played their 1st Detroit gig, is undergoing major improvements since a local family bought the place.