Brian Steinberg Senior TV EditorNBCUniversal has pushed in recent months to change the way TV audiences are measured and to shake up the methods Madison Avenue uses to place ads, but at least one thing about the Comcast-backed media conglomerate will remain the same: the location of its main upfront presentation.NBCU pledged to hold forth from Radio City Music Hall once again, just as it has for many years before the coronavirus pandemic scuttled the in-person extravaganzas that have become so much a part of the TV networks’ annual pitch to advertisers. The owner of the NBC, MSNBC and USA networks said it would kick off the industry’s annual Upfront Week on May 16, with an evening event aimed at promoting Spanish-language outlet Telemundo, marking a return to at least some of the traditions of the annual market, when U.S.