Travel light, you really, really don't need more than the basics and you don't need the jimmy choo's - they just aren't de rigueur for this occasion and you WILL be walking for hours. When it starts to rain as it usually does at some time during these events, and when you find yourself facing a several mile hike to get to where you want to be - there will be tears - you'll be miles from anywhere - and you'll be very, very sorry - not to mention the fact that you will seriously piss off your mates with all the whimpering that will inevitably accompany your discomfort.
Boots, strong waterproof boots are a really good bet, even if the weather's great and the ground dry - when it gets dark and you're trudging back to your tent trampling over all manner of unpleasant things - you'll be really glad you got those boots! Have you tried trudging out of the arena at night in a flimsy pair of flip flops? - enough said.
Get yourself a pair of wellies and some good quality socks - both waterproof and comfortable - whatever you wear on your feet take them off when you go to bed - wet feet = 'trench foot'. This is not nice, not nice at all! Avoid at all costs.
Waterproofs are an absolutely essential item - they take no space and weigh nothing but when its hissing it down you'll be laughing, Take a spare pair of trousers so you've got a fallback if anything happens to your fav 'wear everywhere set'. Jeans are not awfully good if the weather is wet - they have a tendency to soak up the water - get very heavy and take forever to dry out. Go for stuff that's versatile, a sarong is a great standby item, wear them as a top, headgear (hides the hair you haven't been able to wash), tie as a skirt or dress if the sun puts in an appearance! Adds an extra layer if it chills down and can look really cool!
Combats - short style combats are a Godsend! Layers - think layers - several light layers like a thin t-shirt with sleeves or a thin cardy is better than one thick jumper - also you can tie them round your waist when it's hot and pop them on when the sun goes down. Take a couple of your favourite t-shirts and a warm jumper, cardy or fleece for when the sun goes down... it will get chilly even if it's been stifling all day - you will shiver.
So the basics would be one complete change of clothes which will get you through the weekend quite nicely but do make sure you have something to travel home in - what looks great on site at the festival may look a tad conspicuous en route home - and if it's been pissing it down all weekend you'll be covered in mud - that spare 'going home' set will be a lifesaver.
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