A hopefully helpful note from feedback this time:
For accommodation, we don’t really have a specific hotel in mind yet. Instead, there’s a great selection of hotels in San Sebastian (or Donostia) and we’ve heard great things about Airbnb. For larger groups, there are also some interesting choices via https://www.homeaway.es/
For amusement, there’s the lightly themed Astoria 7 where you can stay in a room named after a random movie star.
To get between Irun (the venue), the airport, and San Sebastian, there are a variety of options. There’s the local commuter train first (because trains are awesome) which costs roughly 2.45 euroes and the local bus looks similar. It looks like taxis cost roughly $50 Canadian.
More info on the local train system/GO train equivalent but do keep in mind that the venue, train station, and airport are not next to each other. More info to come.