This couple were given the best engagement gift anyone could ask for – and they received it only seconds after she said yes. Drew Bargsley and Chelsea Townsend were enjoying the Garth Brooks concert in Oklahoma City on Saturday night when Bargsley interrupted the show with an important question. style=”display:inline-block;width:300px;height:250px” data-ad-client=”ca-pub-8420654331411867″ data-ad-slot=”1313712966″> In a grand display…