I missed out on Too Many Bones: Unbreakable events. How would I go about trying to find anyone that might be bringing the game for open gaming?
Post here or on the Fans of Gen Con Facebook group or the Reddit group.
I think the official discord has a pick up game channel as well.
You can track new events, returned tickets, and deleted events at this website. It updates 4 times a day and it is very useful for finding tickets that are returned for events that you want to try to grab.