I've never been to a figure skating event live before...how soon do tickets generally sell out for competitions? I'd assume you have to book world and Olympic tickets a year+ in advance, but what about GP assignments and Senior B's?
Deends on where they are and who's going to be there. Yuzu is the biggest drawcard in the skating world (there is a reason why Montreal Worlds put him instead of the current WCs on their advertising when also releasing the sky-high prices they hope to get). NHK is always a battle royal even without him, with him it's going to be Roman Colusseum style (buying tickets for the Japanese ones is ridiculously difficult for foreigners anyway, from what I've read) and if the TBA does turn out to be Takahashi, bloodbath will be a mild term for what happens... Skate Canada may be easier but still probable sell out (as you say, Autumn Classic sold out on the possibility he would be there)