Hardly anyone uses steam groups. So the chances of someone noticing an event announcement within those few mins and joins the server within that time is practically null.
Besides events are never really planned. They just come and go whenever we feel like doing something.
I agree with Nick, Why would someone take 30 seconds out of there day to announce an event to gather players on the server? What are you guys fucking stupid or something, god use your brains for once. (If you couldn't figure it out, this was sarcastic. I didn't want to offend some dumb ass with a sarcastic statement.) Once more on this exposure topic, does it really take a lot of effort to get on the Steam group page and announce an event three minutes before it occurs? I have the steam group set so it will tell me any event that is occurring. I know that I would for sure get on the server for a few minutes to take part in an event, and I don't think I am the only one. I really don't know why Alaskan or another caring admin wouldn't use there resources to advertise the server and/or events with Steam, Facebook, or any other social media platform.