The qualities for a song of the type you want are these: it has to be simple; it has to be upbeat; it has to be fun to sing.
Uptown Funk - upbeat, fun, but hard to sing in parts.
Hotel California - well known, easy to sing, not particularly upbeat or fun.
Margaritaville - passes all three tests, but bad optics because of the alcohol tie in. Also, not quite "Cal"
I Feel Good - passes all the tests, but frequently used as a between innings fan-cam song at MLB parks.
Friends in Low Places - See Margaritaville
Good Vibrations - Fun, upbeat, too hard to sing
Fat Bottomed Girls - Passes all the tests, but be prepared to sell it as an anthem of body positivity in response to the howls of outrage that will come.
Start Me Up - upbeat, fun, but hard to sing in parts.
The Hokey Pokey, YMCA, and other songs that are banned from wedding receptions - No - just no
We Are the Champions - Done to death
Shout - Done to death, frequently used as a between innings fan-cam song at MLB parks
Uptown Girl - Sorta passes all three tests
Freeway of Love - Sorta passes all three tests
The Brady Bunch Theme and the Flintstones theme - woulda worked great 20 years ago
The Cal Drinking Song - It's have to be an abridged version - not so much for bad content (there is the booze tie in again) but it goes on forever.
California Gurls - (Katie Perry) upbeat, fun, hard to sing in parts.
Goin Back to Cali - Kind of a dated reference at this point.
California Girls - (Beach Boys) Dated, but meets the three part test. Hey - not all of the California Girls of which they sing are from south of Big Sur!