Absolutely. I heard there is a cancelled YPO conference in San Diego right now and 300 people still showed up and it's turned into quite an unconference. https://www.ypo.org/exclusive-events/ypo-global-edge/

Certainly possible. If you book the event in corporate environment, the organiser may not have your direct email, and whatever system or person gets the notification may not forward it to you.

This news is being shared everywhere in game dev circles, it would be really hard to miss.

I wouldn't be surprised if it was more than one.