It's too much of a risk for the tour to play an event on dormant bermudagrass, particular the fairways. Potential for a lot of white paint and/or thin areas. That's why you see overseed on courses that are hosting the events in locations where it would go dormant-Torrey Pines, Scottsdale, Palm Springs, Bay Hill, Harbour Town and of course, AGNC.
For example-Eagle Point in Wilmington, NC, home of this years Wells Fargo is overseeded. They do not typically seed, but are filling in for Quail Hollow.
Colonial is one of the first courses on the schedule that the Tour plays on where the bermudagrass goes dormant and the tour plays on it as the grass has come out of dormancy. We would have to push and push and push to get the Bermuda filled in and the rough up for the event with fertilizer applications every 5-6 days as we got closer to the event.