Just ordered on eBay (waiting to hear when I can pay & collect it) a folding stool, that's suitable for regency events. I really want a chair, but this will be lighter as I'm schlepping myself around on by public transport - both bus and train. Seeing as Winterfest is at the end of this month I'm really looking forward to having my own seat. Though maybe like last year I'll spend my time napping on the ground.
and yes it may be slightly posher than working class, but it's transportable by design.