My association uses Arbiter, and Arbiter will show cancellations. We usually also get association-wide emails that games are cancelled and are reminded to check Arbiter before leaving for the game. Arbiter is our official notification.
My association's rule is that you get first chance at the game if it is rescheduled, even if you are blocked as unavailable (basically the rescheduled game is yours until you turn it back). If you are already scheduled for a game at the rescheduled time, then you would lose that game.
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