Fri is the folk club
the Plough in Prestbury is a session every Thursday. To find it you have to go through Prestbury towards Whinchcombe and after the left on the main road hang a left, it is near the church.
More data including predicted dates for (say) alt weeks (mostly), post codes for your SatNav (or the OSGR) - go to:
regular Folk events within 20Km of Cheltenham
hint you can choose a different town within my area.