Former Pennsylvania Sen. Rick Santorum, left, speaks as former Massachusetts Gov. Mitt Romney listens at the South Carolina Republican presidential candidate debate in Myrtle Beach, S.C., Monday, Jan. 16, 2012. (Credit: Pool,AP Photo/Charles Dharapak)

Mitt Romney will host a roundtable titled "Jobs and Big Labor" at Compatico in Grand Rapids Wednesday. It will be followed by what his campaign calls a "Grassroots Rally" at the same location at 6:15pm.

Rick Santorum will speak to the Detroit Economic Club at Cobo Center on Thursday. He'll then speak at the Oakland County Republican Party's Lincoln Day Dinner in Novi. Governor Rick Snyder and Ann Romney are also expected to attend the dinner.

Newt Gingrich and Ron Paul have not announced any events in Michigan so far.