what’s an Ann Arbor thing you had to experience twice before you understood why locals plan around it?

the first time, you assume it was just bad timing.

then it happens again.

and eventually you realize everyone who has lived here for a while has already adjusted their routine around it

i'm not talking about obvious major events where everyone knows the city will be busy. i'm thinking about the smaller stuff that isn't really explained until you've been caught by it.

a particular weekend. a recurring traffic problem. a road that becomes useless for a few hours. a seasonal change that affects parking, walking, shopping, or getting across town

what was the moment where you finally thought, “oh, this is just how Ann Arbor works”?