Andres Orozco-Estrada hasn’t been back to Texas to conduct his orchestra for a year, but he had been planning to return for concerts May 7-9 and May 14-16 to close his next-to-last season in Houston. (He’ll step down in the summer of 2022.) But the U.S. government’s National Interest Exemption on pandemic travel restrictions for certain artists expired in early March, exceptions are no longer being considered, and Orozco-Estrada learned at the last minute that he wouldn’t be allowed to enter the country. David Robertson is filling in for him. – Houston Chronicle