It will likely be months before big concerts make a comeback, however, there is the question of coronavirus safety once shows do resume and the large crowds that will gather. Ticketmaster has come up with some guidelines to help event organizers figure out how to get audiences back into these live events safely.
Ticketmaster may check for COVID results, vaccine status before concerts. See story here. https://wgntv.com/news/coronavirus/ticketmaster-might-check-for-covid-test-results-vaccine-status-before-concerts/