As parades prepare to roll this weekend in the Baton Rouge area, some Mardi Gras krewes are rescheduling start times due to expected rain on Saturday. The Krewe of Orion parade, which was originally scheduled for 6:30 p.m. Saturday, will now take begin at 6:30 p.m. Sunday. The Orion masquerade ball will be held at its original time Saturday, the krewe said in a Facebook post.