According to the ticketing policy, if you don’t buy a buffet ticket but still want to enter the temple fair (庙会), it’s likely that you can still go in. However, without consuming any food or drinks from the self-service dinner area (不吃自助晚餐), there might be restrictions.
It ultimately depends on individual circumstances and specific regulations at each temple fair location. In general, if you only want to explore the exhibitions, games, or other activities without participating in meals, it’s possible that admission will not require a buffet ticket purchase.