Yep to many in SE Michigan it's a rite of spring. Some call it " Stocker Fest". Flies only C & R April 1st thru the regular trout opener. I used to go out 1-2 times each spring but haven't done so for at least 5-6 seasons. You ought to see the regular season opener the last Saturday of April-what a zoo! Bait Fishers lined up elbow to elbow fighting to catch their limits.
This program has been going on since the 1970's. The Mich DNR & a club got it going to offer Detroit area anglers a chance to fish for trout in the region. It was a pretty big story the first year it occurred.