A Praepostery?

It is a weekend of several Provosts. The Provost of the Cathedral of the Diocese of Gothenburg is here this weekend so I’m off to Kelvingrove today being a tourguide.

Tomorrow, I’m hoping to meet the new Provost of St Paul’s Cathedral in Dundee. Thus, three Provosts are likely to meet in the same place at the same time, thus raising the inevitable question. What is the collective noun?

Your suggestions please.