The start of training camp is tied to a team’s first preseason game. So with the news that the 49ers’ preseason opener in Oakland will be on Aug. 8 came the announcement that training camp kicks off Thursday, July 24. If you’ll remember, last year training camp didn’t begin until July 29 and that Mike Nolan wasn’t thrilled about the late start. This year’s schedule should make him happier. As has been the case the last few years, 10 training-camp practices will be open to the public. Those dates have not yet been announced.