Lynne,
I went to a couple of the loft singaronds and while they were not mobbed there were always enough people there to make it enjoyable. I can't say I noticed any problem with the hosting.

I tend to agree that themed singarounds put me off, but I didn't feel this was intrusive in the sessions I went to.

It may be an idea to consider having a continuous singaround venue, obviously with a rota of hosts, so that people can go and have a sing as and when they feel like it. I always feel that the stop start slot thing is a bit of a dead hand on atmosphere.

Robbie
( I realised I was not signed in after I had written this)