They typically do sell out but not always fast. This one appears to be of reduced size so seems likelier to sell out. But ask the SuperSonics whether Seattle events tend to sell out or not
. Even if/when it does, as fragz demonstrates there is always a lively secondary market for tickets.
Bottom line: my guess is you have plenty of time to decide.
I mean, the website isn't even up for this event yet... Just the payment portal!