A visit to one of Oxfordshire's best music festivals and it's free (to get in - you still have to pay for drinks and food. You can bring your own but no alcohol - but it is for sale - or glass bottles).
The event starts at 12:00 noon on Saturday and 11am on Sunday but I have set the meetup time for 1pm so you can get in and have a look around before meeting. Charlbury is easy to get to by car (park around the village or at the station or cricket club) or train. It's a good idea to bring something to sit on such as a chair or rug. Also the weather may be changeable so waterproofs and something warmer for the evening is a good idea.
Note - I have put the railway station as a meeting point as it's the nearest places with an address. To get into the festival site from the station cross the road and turn right over the river. The entrance is just on the left and it's a short walk to the main stage.