A sociable and mainly traffic-free ride to Bath Christmas Market, suitable for families, everyone welcome.  We'll spend some time there (lunch, mulled wine, etc.) before riding back.  Total distance 30km (just under 20 miles) and basically flat at a relaxed pace suitable for the group we get on the day

Bring locks and lights - it could be pretty gloomy by the time we get back - but I should have some spares available to borrow.  Apart from that no need to carry much (clothing for the conditions, water, and a spare tube if possible) but you might want space to bring stuff back.