There are several public parking lots with in a very short (1/2 block) walk.
To answer your question succinctly I would have to know who's playing, big names, less parking... Get there early, or I like the other local guides answers, use a ride service, especially if you're drinking. You don't want to drink and drive in Big Bear!
Lots of parking on the street and lots of public lots. There are also taxis, Ubers and Lyfts (although not a lot) if you are drinking.
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