There are a number of morris sides in Gloucestershire/Oxfordshire but you may have problems getting one at such short notice as they often have their programmes worked out well in advance and can't take short notice bookings. However, you could try looking up the sides on the Glosfolk website http://glosfolk.org.uk/and follow the link to 'dance'. I can tell you that the Gloucestershire Morris Men, the side I dance with, will not be available, but there may be a side that can. Prepare to spend some time ringing around.
There may be other ways of getting folky entertainment, if you're really set on that. Send me a PM and I may be able to help you.