The popular Border Grill at Mandalay Bay is about to get even more popular. This summer, it is launching pop-up BBQs to coincide with the Concerts on The Beach. When concerts happen, Border Grill is morphing its patio into a BBQ from 6 p.m. to 8 p.m. and will serve up all sorts of tasty goodies with items prices from $3 - $8.