what events in fgo NA that have re-run?

We never had a rerun in NA. The first rerun will be Halloween (Nerofest is different from the last one) and the second one will be Christmas.

This year will be the first year of reruns. Any event that wasn't tied to an anime release will likely get a rerun

If you mean what events have already gotten a re-run, the answer is none like the other guys said. If you mean what events we've had that will eventually get a re-run, then that list contains:
Moon Goddess
Halloween 2017
GUGAGUDA Honnoji
Christmas 2017
Saber Wars
Kara no Kyoukai
Coming to the West
Rashomon
Onigashima
Summer 2018
It won't be necessarily in that order, but all of those events will eventually get re-runs. Hope this helps.