Two things you might not have otherwise associated — the ongoing tragedy in Japan and the impending arrival of Britney Spears in the Castro this weekend — are now loosely connected.

The public has until midnight tonight to enter an auction to win two VIP passes to the pop star’s outdoor performance being filmed this weekend outside the Castro Theatre for an upcoming segment on “Good Morning America.” The proceeds benefit the Salvation Army Japan Earthquake and Tsunami Relief Fund.

To enter the auction, visit this website. As of Monday, The Salvation Army had raised approximately $3.75 million from across the country for Japan relief efforts, according to a press release.

Spears is set to take the stage at noon on Sunday amid cordoned-off streets and an undetermined number of fans who will be let into the area for free. The “Good Morning America” piece, which will also feature Britney matriculating in the Castro, is set to air Tuesday.

dschreiber@sfexaminer.com