Bring your guns, but leave your signs.

Bring your guns, but leave your signs. A second amendment rally at the Capitol building seemed to be contradictory: gun rights advocates could carry their weapons openly, but had to leave their signs behind. This is because of a rule protecting the historic interior of the Capitol building. Article here.
 
Michigan was in the spotlight last year because of a law that passed allowing weapons in previous weapon-free zones (schools, churches, daycare, and sports arenas), which was then vetoed by Gov. Rick Snyder. Gun supporters were at the Capitol asking lawmakers to support the proposal again this session.

Firearms in Michigan: What's the law?

Michigan has a number of statutes that deal with weapons ownership. Here's what the Michigan State Police has on its website about weapons.

Michigan notably entered the news the same day as the events at Sandy Hook due to passage of a law that allowed concealed weapons in previously off-limits locations, like churches, schools, day care, and sports arenas.

This wikipedia article  has a great table summarizing what's allowed for what weapon in Michigan.