I too was disconnected during the event.I tried to log back in but it wouldn’t have let me in.When i finally logged back in the event it had already ended with the reward chest gone.
I hope Anet will do somethink about this and will compensate us with the same rewards as the other players.And to keep this from happening again,if possible with same events as this.I aslo have proof of been into the last phase of the event.
