K.S.
I am a big proponent of "flexible" schedules. With my three children, they had regular nap and bedtimes, but there were times, for a variety of reasons, when the nap was skipped or taken somewhere else or bedtime was delayed. We were not a family to rush home for naps/bedtime. My kids did great with it and quickly learned to adjust. It didn't happen every day or even weekend, but it did happen enough that they dealt with it just fine. That's not to say we didn't have a crabby child on occasion - when that happened, we did the best we could in helping everyone cope.