I may well have looked critical above, but the basic idea is excellent - hence my remarks about high expectations - and should be persevered with.

Suggestions:

No amps in the sing/session.

If you must record the sing-session, stick a mic out from the corner of the bar canopy, and lose the man with the gopher on the stick - he was very intrusive. You could even stick up more than one directional mic, and take leads to an upstairs room for recording. NB recording without consent is an infringment of performers' rights, and if copyright material is performed, an infringment of copyright too. If mixing desk is used to facilitate recording, then there could be speakers relaying (not too loudly) the sing to the pavement and smoking area.

Less intrusive MC-ing. Just point out the next lead perfomer is all that is needed.

I am ambivalent about the secondary sing over the post office side. Particularly if it involves stepping it carries rather too well into the sing bar.

Pick up the stepping floor in the sing room when not needed.

Encourage people into the sing room into the space created by reducing electric/recording/MCing/stepping use of space.

Put any necessary heaters on at least 3 hours before event to be heated.

Is there anywhere to run an actual workshop on Kent local songs? Songsheets (with dots) of songs to be taught.

Is there space for any Kent Morris sides?

A more informative programme. Sell it to raise money.

If concert performers will consent, live CD of concert sold to raise funds. Pretty well any PC today is an adequate studio.

Is there any useful local parking space?

Patio heaters in smoking area on!