As far as I know, it is still active. Last year, they garnered more flights worldwide than other years. It is usually around the first weekend in October, subject to officially announced dates.

I believe that the owners of the Brotherhood of the Ring discontinued the forum because traffic and posts to the forum dropped down to almost nothing two years ago. It seems that I and may be another two were the only posters. It is difficult to justify server costs with such little participation. Sadly, it is no more as was with Stuka Stunt.

I am not an FB member, so I rely on other announcements (like in this forum) for dates.

All Ringmasters and variants qualifying as Ringmaster (for example, the fuselage from another say, scale or other plane with flying surfaces (wing, stabilizer/elevator, rudder) following Ringmaster outlines, are eligible. Doc Holliday has (or had, was crashed last time) a Ringmaster canard C/L. For an example, some years back, I made a half-A Ringmaster Gee Bee Z with Gilbert .074 Thunderhead.