There used to be Snapshot special events that I guess died from lack of participation. That was like a mini FSO with no prior commitment or squad affiliation needed. I enjoyed the FSO's that I flew in but these days Friday evening is not predictable very far out and I guess that a true 'walk on' structure doesn't work with all the planning for FSO.
Bottom line is more players.
Brooke still runs D-Day and special ops during the year.