Here is the information from 49ers.com regarding the dates of training camp and which dates will be open to the public.
The San Francisco 49ers and the San Jose Mercury News are offering the 49ers Faithful free tickets to the first of four open practices during the 2009 training camp — Mercury News Day. That practice will take place on Saturday, August 1, at 8:30am.
The only way to get these exclusive tickets for the first day is through the San Jose Mercury News. Purchase the Mercury News on Tuesday, July 14 and look for the special “Training Camp Code” and instructions. Or go to Facebook.com and sign up as a fan of the San Jose Mercury News and receive news about the promotion on Tuesday. Either in print or online, you will receive instructions on going to 49ers.com to print your free tickets. One ticket admits up to two people.
Additional practice sessions open to the public: Saturday, August 1 (4:30pm); Saturday, August 8 (8:30am & 4:00pm). Gates open an hour before practice begins. Information regarding online ticket registration for these sessions will be provided at a later date.