Pre-existing friends, postings on Facebook (even though FB does not distribute events to the timelines of group members if there are more than 250 people in a group), occasionally lesswrong.com (not event postings, but more that people who are actively interested LW seek out a Tel Aviv group)
Pre-existing friends, postings on Facebook (even though FB does not distribute events to the timelines of group members if there are more than 250 people in a group), occasionally lesswrong.com (not event postings, but more that people who are actively interested LW seek out a Tel Aviv group)