No founding day?
 

Just curious, does anyone belong to any GLO (Social, Service, Professional, Honorary) that doesn't have a specific founding *day* and if so, what's the situation? The History isn't specific enough, the founding process was so stretched out that it doesn't make sense or some other situation?

I'm looking at various Honor Societies right now, and while the majority have a specific day of founding, there are a few that just have a year, a few that have a season and a few that have a month (For example, Tau Alpha Pi, 1953, Scabbard and Blade, Fall 1904 and Tau Sigma Delta, May 1913)