It's a shame you abandoned it, I've tried to find some groups for myself but it's been impossible.Depends on your area I think. I used to live in Cincinnati and was part of a pretty good one and we stayed busy. Now in central Florida I haven’t found one specifically dedicated to gangbangs but there are BBC groups that attend and host parties here and occasionally try to put one together but even that can fall through sometimes.
Problem is both the couple/women and the men can be flaky or have scheduling conflicts. I used to try to organize them and had some wonderful successes but the hit rate is so low it’s just not worth it unless you make it almost a full time hobby.