Just to clarify: the tickets going on sale this Wednesday, September 19th, will be daily tickets, not tickets to individual games. If Canada happens to play on the same day as Slovakia, those tickets will be gone instantly. (Obviously, when they play each other, too.) Also, you can buy "all round-robin games by Canada" tickets (starting from €380) or "all games in Košice/Bratislava" tickets (starting from €1015/€1590) this Wednesday. Tickets for individual games will only go on sale in February 2019 – if there are any left, I guess. (Perhaps it's mandatory for at least some of them to go on sale that way, too.) Hard to tell about that Canada vs. Finland matchup specifically – it's an attractive one, so it might well sell out quickly... or not.