Fairplex Oktoberfest runs every Friday and Saturday evening in October — German and craft beers, bratwurst and pretzels, live polka, and the Fairplex grounds actually big enough to hold the energy properly. 21+, $20-35.…Fairplex Oktoberfest runs every Friday and Saturday evening in October — German and craft beers, bratwurst and pretzels, live polka, and the Fairplex grounds actually big enough to hold the energy properly. 21+, $20-35. Who's going to Pomona this fall? more