they plan to invite well- knownperformers and orchestras from around the world for guest performancesthe orchestra will hold a free outdoor concert this thursday at noon. >>> the plaza was fill would bicyclists today, not critical mass. it's the gear to san francisco. the series of races will take place all day ending with a 40- mile pro run at 3:00 p.m. the event has been going on since 1975. at one point, it included the bricks down lombard street. >>> the family that runs a concession stands at san francisco's lake will close up shop today to make way for a new vendor. his grandfather started the boat rental and snack business 68 years ago but the lease expired and the city issued an evacuation notice for september 15th. some people are concerned about any changes that might affect the charm of stow lake. others feel it's time for an upgrade. >> look at it. the paint's peeling. it's a dump. the food was stale, the popcorn was crappy, the dogs were rancid. >> new management arrives in just a couple of weeks with a fleet of new boats and plans to turn the shop into a cafe. >>> ahead,