LANSING, Mich. (AP) — Twenty of Michigan’s state parks and recreation areas will stay open late during International Dark Sky Week, which begins Monday and continues through next Sunday.

The state Department of Natural Resources says the parks are good spots for self-guided stargazing.

If you’re interested, call ahead for individual park hours and bring a blanket to deal with frosty night weather.

The Besser Museum Planetarium in Alpena will host an information program about the night sky Friday at 7 p.m. Participants can then visit Rockport State Recreation Area harbor for night sky viewing.

Many of these events are free to attend, but a Recreation Passport is required for vehicle entry.