Several August dates are also affected, including three concerts in Ohio and one in Pittsburgh. A message on LaMontagne’s official site said the cancellations were due to “unforeseen conflicts in his schedule.”

LaMontagne is still on board for most shows through August 19.

Guster and LaMontagne have been on the road together since July 11 and were scheduled to kick off another round of concerts in September. Nada Surf has taken the singer/songwriter’s place and will open at all dates from September 19 through October 4.

As a result of LaMontagne’s departure, the tour will make only one stop in Los Angeles, at the Wiltern LG September 29, rather than the planned two-night stand.