Same happened for my event playthrough,
about 1.5 to 2hrs in the game suddenly crashed, but I was on a team of four players.
All of my squad had the same experience.
We were all in a new overflow area in which the event finished.
I would like to know how to get back into the event with my squad so we can finish,
Or otherwise get another chance to see the event.
Otherwise,
Amazing game,
Enjoying it a lot.
Sincerely,
Cyrus