Brianna Stone

At their annual Red Dress Gala philanthropy event, the sisters of Chapman University's Alpha Phi chapter were surprised by two famous guests in attendance: singers John Mayer and the Grateful Dead's Bob Weir.

Saturday night in Orange County, Calif., several sisters snapped photos of Mayer, gawking over his presence at their event.

This Alpha Phi sister was lucky enough to get a selfie!

But it wasn't just the women who were excited about this special guest of honor.

Unfortunately, not everyone was able to admire Mayer in his suit and bowtie.

Weir, a founder of the Grateful Dead, was in attendance to support his daughter Monet Weir, who is a member of Chapman University's Alpha Phi chapter. Mayer appeared to be a guest of Weir and his wife — the two musicians play together in Dead & Company.

After the night was over, Mayer tweeted his farewells.

The Red Dress Gala is a philanthropy event held by Alpha Phi chapters across the nation — a night of eating, dancing and silent live-auctions to raise money for the Alpha Phi Foundation, which focuses on women's cardiac care.

On their website, the Eta Upsilon chapter at Chapman University says their chapter was one of the first to host the Red Dress Gala. They have raised more than $308,513 through philanthropy events in the last 20 years. With the Red Dress Gala alone, this chapter has raised more than $165,000.

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Brianna Stone is a USA TODAY College digital producer and a student at the University of Texas-Austin.

This story originally appeared on the USA TODAY College blog, a news source produced for college students by student journalists. The blog closed in September of 2017.