From the Michigan DNR:
Upcoming Free Fishing Weekend dates for 2022 are: February 19 & 20 and June 11 & 12. All fishing license fees will be waived for two days. Residents and out-of-state visitors may enjoy fishing on both inland and Great Lakes’ waters for all species of fish. All fishing regulations will still apply. A Recreation Passport will NOT be required for entry into state parks and boating access sites during Free Fishing Weekends.