Are you driving or flying?
If you are flying I would say no. Anything can happen due to flight delays. Last trip our plane had a mechanical failure. We arrived 12 hours late. I wouldn't risk non refundable tickets that way. It was bad enough we lost FP+ and our BOG ADR.
On past trips we have driven and flown, stayed with family in the Orlando area for 1-2 days and then go to the park bright in early to check in. In that case I would do the party.