I always call before b/c I hate waiting. We've been way too many times this year and they always get me a spot during the sick open hours and we never have to wait.
Late responding, but I would also recommend calling first. I guess if you had your sh!t together, unlike me, and showed up at 8:00 you might not have to wait too long though.
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Re: Treehouse sick visits
Yep!
The earlier the better.