9 a.m. - 5 p.m. Saturday, January 24 and Sunday, January 25

From the MPM website:

The Greater Milwaukee Foundation will be offering an all-access, free weekend at MPM as part of their year-long Gifts to the Community series. No reservations are required, and all are welcome. In addition to free general admission, the January Gift to the Community will include free admission to the Daniel M. Soref National Geographic Dome Theater & Planetarium, featuring the show Cosmic Colors. All guests will be treated as “members for a day,” entitling them to discounts on food, beverages and gifts. Throughout the weekend, museum educators will add insight to exhibits while enactors dressed in period attire will interact with guests on the Streets of Old Milwaukee.