There have been various comments (including my own) in this thread about making a weekend of it. Whilst I don't want to pre-empt Simon's organisation as the originator of this event, here's my suggestions:
Saturday: Bwlchglas as originally planned. I suspect we won't have a great deal of time available to us when we come out. So, weather permitting, perhaps a walk around Talybont to try and find the viewpoint for Roy Fellow's reconstructed 'photograph' of Talybont as it was when the mine was active. Alternatively/also we could have a walk in the forest to the west of Talybont to look at the shaft of Alltycrib mine (which some may wish to descend).
Saturday evening: There are two pubs in Talybont (they are next door to each other) - I would hope we would find one of them to our liking. They serve food, and I'm told there is also a Chinese takeaway in nearby Bow Street. Of course, the more adventurous might want to head for the bright lights of Aberystwyth.
Sunday: I suggest meeting 10.30 at Henfwlch SN 7377 8837. To be followed in the afternoon by a trip to Ystrad Einion to see the underground waterwheel. It might be possible to fit in a trip to Brynyrafr but it's not a mine I know - perhaps Roy would comment on this.
Obviously, people would need to make their own arrangements for accommodation in/near Talybont.
This is not a hard and fast plan - it's just a suggestion until something better comes along. So, if anyone would like to suggest alternatives please do.
Dave