It will be tight, with most character meals taking at least an hr., and people posting that they have been seated well after their ADR time at this meal. I would keep trying to get an earlier ADR, but if you can't, as PP mentioned show up early to check in, pay your bill/scan bands at the beginning of the meal, and if you are waiting for a character to make their way to your table, ask a waiter for help. With 2nd show during a less crazy week, you have a shot, but it would be nicer if you didn't have to rush and try to get seats at the last minute.