SAN FRANCISCO -- Matt Cain entrenched himself not only in Giants lore with his perfect game, but also in the city's calendar.

San Francisco Mayor Ed Lee, on hand at AT&T Park to give Cain the key to the city in recognition of his June 13 gem against Houston, declared that every June 13 will be "Matt Cain Day" here.

"Thank you for treating us to a wonderful, historic tribute of your skill," Lee said in a pregame ceremony Tuesday.

Also during the festivities, baseball Hall of Fame president Jeff Idelson received first base from Cain's big game and the spikes and cap the right-hander wore that night. Those items will be displayed at the game's shrine in Cooperstown, along with other mementoes of Cain's performance: a game-used baseball, one of the "K" signs denoting a strikeout that hung on the wall in right-field foul territory, copies of San Francisco's two newspapers, the Chronicle and Examiner, dirt from the pitcher's mound and a collection of game tickets.

Idelson said that through the rest of the year, the Cain mementos will be displayed in the "Today's Game" exhibit gallery, which features items culled from milestones that occurred this season. After this year, most of the Cain relics will move to a perpetual Giants gallery. The ball will join a collection of baseballs taken from every no-hitter thrown since the Hall's museum opened in 1939.

Giants get out All-Star vote on 'Super Tuesday'

SAN FRANCISCO -- The Giants teamed with 15 of their biggest Twitter supporters to hold a "Super Tuesday" voting event during Tuesday's game against the Dodgers to help support Giants players in All-Star Game voting.

The club invited 15 fans who had tweeted about how much they've been voting for Giants players to come to AT&T Park to a conference room that was decorated to be the "Campaign Headquarters," where the participants were provided with computers to vote as many times as they could throughout Tuesday's game.

"We wanted to take the chance to not only reward them, but ask them to help us," Giants director of social media Bryan Srabian said. "We asked them to come in and spend the game voting. This is just all about our fans getting behind a special campaign like this. It's exciting."

Updated voting totals Tuesday had Melky Cabrera trailing Milwaukee's Ryan Braun for the third National League starting outfield spot, and the Giants are hoping that a late push for voting could push him into the top three before voting ends at 8:59 p.m. PT on Thursday.

"I figured there's no one else that's more deserving than Melky to be an All-Star, so I might as well do my part and come and vote," participant Sergio Rodriguez said.

The 15 participants were provided food and other refreshments as they huddled over their respective computers, with the Giants-Dodgers game being shown on a projector screen. They used different e-mail addresses to vote as many times as they could for players like Buster Posey, who held a 216,452 vote advantage over the Cardinals' Yadier Molina for the top spot for NL catchers as of Tuesday.

"I would have done the same at home anyways," participant Robert Leung said.

Giants mascot Lou Seal, reliever Sergio Romo and former Giants pitcher Dave Dravecky stopped by the conference room during the event.

"I grew up watching the Giants and I idolized Dravecky," Rodriguez said. "His whole story was just amazing. In 1989, when he went down with his arm, I cried. I've never met him in person. That was the highlight of my night."

Huff stays positive, determined to contribute

SAN FRANCISCO -- Aubrey Huff took light batting practice and played catch before Tuesday's game against the Dodgers and said his sprained knee is almost recovered to the point where he can begin running again.

Huff injured his right knee during the postgame celebration for Matt Cain's June 13 perfect game, with the injury coming after Huff's disabled-list stint from April 25 to May 7 with an anxiety disorder.

"It's almost hilarious for me right now," Huff said. "Whatever can go wrong will go wrong."

Huff's misfortunes off the field have come as the Giants have played themselves near the top of the division and Wild Card standings, and he said it has been tough to be a spectator to the team's success, not a participant.

"Personally, it's been a nightmare," Huff said. "But you have to roll with the punches; it's part of the game. I'm just trying to stay positive."

The 35-year-old Huff, who is in the final year of a two-year, $22 million contract, said retirement has not been an option so far. As far as his potential contributions once he returns, Huff compared himself to Edgar Renteria, who battled through several DL stints while with the Giants in 2010 only to come back as the starting shortstop in the team's world championship run and was named the World Series Most Valuable Player.

"I've never been a quitter," Huff said. "I always try to finish what I start. I don't want to raise my kids with them thinking it's OK to quit. You never know. You get into the playoffs, it's late in the season, there could be a big at-bat, and if you're ready to go you could get a bit hit in the end."

Huff injured his knee when he tumbled while jumping over the dugout railing on the final out of Cain's perfect game.

"You're in the thrill of the moment," Huff said. "You feel like a kid in a situation like that. After the game, I was thinking that at worst, I just bruised my knee. It turned out to be a little worse than that. Thank goodness I didn't tear anything."