Can nothing ever happen again?
1. Logically: No… or yes.
2. Pragmatically: Yes
1. If nothing ever happens again, then it means at one point nothing ever happened and now nothing is ever happening once more. If nothing is the only thing that can happen then it’s redundant at best and paradoxical at worst to have nothing happen again. There is another interpretation though, that would say if nothing is ever happening again then what is happening is nothing, meaning infinite iterations of nothing are occuring incessantly and thus nothing is happening again (and again, and again, ad infinitum).
2. If “nothing ever happening again” is understood to mean “something never happening again” (i.e. understanding the practical meaning rather than literal meaning), then the physical theory of entropy would allow this. As the finite universe progresses into infinite time it will evolve into a purely entropic state resulting in heat death. When heat death occurs we can begin to validly define the happenings of the universe as ceased. The finer details of the nature of the universe after heat death has occurred may require understanding of deeper entropic states that are beyond our physical knowledge or hypotheses. Regardless, with heat death comes a lack of kinetic energy, which can logically fit the definition of “nothing happens”.
Note: In a heat dead universe, dark energy may still exist and space-time may still expand, thus meaning stuff could be technically happening but just in a way in which the happenings are irrelevant other than unto themselves. In this universe there would be only darkness and stillness other than space itself creating more distance between places of no happenings.