The annual Tequila Festival in Tiujana. Oct 6 thru 13. Costs 6 bux, good for all days. Something like 30 different suppliers of tequila, they typically have 3 or 4 styles each. That is a lot of different tequilas to try, no wonder it lasts for days. And they have good food there too.
And, if you come back over the border on the shuttle bus, which is considered a 'common carrier', the Cali rule on 1liter/person is waived and you can bring back up to $400 worth of hooch on the bus! Prices are usually very reasonable on the MX side of the border, so that is like an easy 2 cases of booze.
Something to think about.