Starting next Saturday, Walmart outings during the wee hours of the morning will become a thing of the past at three stores around Cedar Rapids.Beginning Feb. 1, Walmart’s two Cedar Rapids stores — at 3601 29th Ave SW and 2645 Blairs Ferry Rd. NE — will discontinue 24-hour operations, and instead close at midnight and reopen at 6 a.m.Overnight operations also will end at Walmart’s nearby store in Marion, at 5491 U.S.