“As the omicron variant surged, Lyric Opera general director Anthony Freud and his team spent the holidays staring down the possibility of losing yet another production to COVID-19: the company’s January run of the contemporary chamber opera ‘Proving Up,’ ” writes Hannah Edgar in Monday’s (1/31) Chicago Tribune. “Lyric Opera announced the postponement of ‘Proving Up’ on Jan. 5 along with a vaccine booster requirement for eligible audiences, citing guidance from Emily Landon of the University of Chicago Medicine…. The Chicago Symphony Orchestra … also regularly consults with Landon… Since the new year, the CSO has continued with performances as planned, albeit with stricter policies for audiences…. Orchestra musicians and staff are not required to be vaccinated [but] a vast majority of its musicians are fully immunized…. Among local classical music organizations, with Lyric, Chicago Opera Theater, Chicago Fringe Opera, the Chicago Philharmonic and the Chicago Sinfonietta all [reported] mandates…. The Boston Symphony, Philadelphia Orchestra and Los Angeles Philharmonic have … vaccine requirements for musicians, [as do] the New York Philharmonic and Detroit Symphony…. The Cincinnati Symphony … affirmed that it accepted weekly negative tests from musicians in lieu of vaccine certification.”