Yesterday may have been Cinco de Mayo, but that didn't stop LiveNation from planting the flag for a new annual event: National Concert Day, a celebration of ? and promotion for ? the increasingly busy summer tour season. The company staked its claim with an afternoon show at New York City's Irving Plaza, where The Today Show 's perpetually-enthused Hoda Kotb hosted an intimate gig for a small audience of reporters and contest winners. Kid Rock and Florida Georgia Line performed short sets, and in between, artists like Billy Corgan and Rae Sremmurd fielded Kotb's questions.??