Get your self an old telescopic fishing pole and attach "individually made" flag / cuddly toy / inflatable banana... Anything that takes your fancy and parade yourself round the festival in the knowledge that your friends will always find you. Can also be stuck outside your tent to draw back your friends after hours of dancing / trudging (in mud) and general festival antics.
Also check out the Oxford Cowley Rd Festival. A day of great music, authentic food from a huge number of places, arts and crafts and loads more... Check it out - Sunday 6th July!
www.glastonburyfestivals.co.uk/
www.cowleyroadcarnival.co.uk/