This is the concert field, the main field, call it what you will ("Festival Field or Field 11 on the Field Map"). The stage is at the bottom of the field, and around the perimeter are stalls. Take a wander up the field, see what there is to see, then go over to the other side and find somewhere to sit. Why the other side? Because the bar is over there!
The bar is a wonder... real ales served in the open air, no fizzy tasteless stuff here. May I recommend a pint of Wadworths' 6X? Old Henry is a toothsome IPA, others at the bar will extol the virtues of the real cider, the lager... even the soft drinks. One end of the bar serves as the wine area. If you would prefer your beer served in something other than a plastic glass, take your preferred receptacle. And here's an important point - there is no backstage bar. So if you find yourself rubbing shoulders with someone who looks really like a well-known musician... they probably are that musician.
On this side of the field you'll also find the Woodworm tent. If you like the band that is playing on the stage, you'll find their latest CD at Woodworm. If you would like your CD signed, go to the Woodworm tent after the set has finished, the band will arrive shortly. The staff at the tent also sell programmes, another requirement, and whatever FC ephemera the band have authorised for sale this year. (There may also be discounted ephemera from last years festival, but don't count on it - and get there quick if you want an option to purchase, they get swamped by people who didn't buy last year, didn't read this guide, and now regret it.)
Down at the bottom of this side of the field, the merch tent will sell you a commemorative T-shirt of this years festival. It might be an idea to buy one. By Saturday night, you'll be vowing to come back next year, and every year after, so in ten years time you'll regret not starting your collection now.
While we're on this side of the field, look out for Leons' veggie stall. It's a Cropredy fixture. Your correspondent is a confirmed carnivore, and usually has no truck with the vegetarian persuasion... but Leon and his staff provide a tasty, overfilled plate of lots of different dishes for around £6 ($10 at current rates of exchange). Like what you're eating? Leon will sell you a recipe book. Oh, and the puddings are to die for. Probably by cholesterol poisoning. But, knowing Leon, probably not, they just taste that way.
Enough stalls, you're here for the music! You know where you can get a drink, you've probably seen half a dozen places selling things you'd like to eat or buy, so sit down and enjoy the music.
Sitting down brings us to the sometimes vexed question of - on what? You may wish to bring a waterproof sheet, or a blanket. You may also care to bring a chair. Many do, but please consider the feelings of the people behind you. A large folding affair will block their view of the stage, so try to purchase something with tiny legs. If you bring a chair from your patio set, the best option is to strike base camp about half way up the field.
If, during the first evenings entertainment, you realise that some form of support will be needed for the rest of the weekend, go into Banbury (bus times are printed in the programme) and ask for directions to Millets, where a variety of camping chairs can be purchased.
When the music ends and it's time to go back to your tent (or whatever) you can exit the field from the top or the bottom, over on the other side. Find your accomodation and do whatever feels right, brew coffee, chat to the neighbours, open a bottle, take a wander round the campsite, linger with people who are singing and playing, they'll be pleased to see you. At a certain time in the morning, you'll slide into your bed with a soft exhalation of satisfaction, and a nearby generator will hum you to sleep....