Do I have to wear a costume?

Absolutely not! Some people cosplay and some do not - it is entirely up to yourself. Plus not all costumes are created equal! Some people create beautiful hand-made costumes that wow us all, but many love to run around in a witches hat for the weekend - both are perfectly viable as cosplay! Cosplay is great fun for those who enjoy it - and it is a great conversation starter,  but many people enjoy the whole weekend in casual gear. Please do note that if you attend the Gala Dinner it is either formal or costume dress - if you turn up in your jeans and tee to that one you might feel a tad underdressed! (but still, no-one would stop you!)