Lyle Lovett Switches Venues

What is up with Lyle Lovett switching venues from Northrop Auditorium to the Orpheum Theatre for his show tonight? I contacted the box office at Northrop and I was told that everyone would get comparable seats for the show at the Orpheum when they exchanged their Northrop Auditorium Tickets for Orpheum Theatre Tickets. the math just doesn't work out. There are approximately 80 seats in the first three rows at Northrop and only around 50 in the first three rows at the Orpheum Theatre. I wonder how the decided who would get the shaft? Why did they switch venues? Wouldn't it have been a lot easier to just have the show at Northrop?