This year’s edition of the Riata Roundup Rodeo & LTX BBQ Fest will take place at the 580 Sports Complex from April 25-27.Vendor booths have sold out for the event, but those looking to register their youngster for mutton busting or the barbecue cook-off may do so.The Riata Roundup will kick off April 25 with slack at 7:30 p.m.The April 26 and April 27 rodeo events will begin at 6:30 p.m. with…