Under normal circumstances I avoid Chico like a parasitic drug-infested Mexican border town save for maybe summer when an appreciable chunk of the fraternal bros & hos retreat to mommy & daddy's for repose from their ethanol-induced intellectual disabilities and HPV-tainted general worthlessness. Destination town this ain't.
Surprised I very much was, you might imagine, when my disdain toward all that is the C-word was rendered null and void by virtue of a longtime pal's entry to wedded bliss and I ventured into the Sierra Nevada big room  for the most seamless reception dinner I've ever attended. What ambivalent expectations I had for Sierra Nevada were trumped within minutes. there is much more class in the top floor of this brewery than its party-hardy local reputation may suggest! The room is huge, with a theater-like ambience and impressively dedicated staff.
I can't attest to prices should Yelpers reading this decide to book the big room for a forthcoming event, but if the price reflects the quality of experience, my guess is it's not cheap.