We understand that many people, despite the regulations, still share their event with anybody who will listen - so with the general public.  Something like - "Please invite your family and friends to attend my event" is a big no-no.   Advertising Fundraisers through social media is technically not allowed unless you do so following their guidelines.  Advertising with a Facebook group is allowed though as long as it is NOT open for the public to see.  Taken directly from the AGCO website, they said this:
Acceptable forms of notification may include social media (not available for viewing by the general public, must be a personal guest list), private invitation, etc.
They recommend to keep a list of ALL people who bought a ticket, and ALL people who said they will buy their ticket at the door.  It cannot be advertised to the public and instead seen as an invite only event.  So just ensure your settings are accurate when setting up a Facebook Event, and you are good to go! Most newspapers now know not to allow advertisements related to Fundraisers because of some legislation that went through in 2013.