Can you give your tickets to a friend? Of course! The tickets aren't bound to you by name, so you can email them to whoever you want and that person can use them freely. So if you've double booked yourself, there's nothing to worry about. Though if the reason is that your boss is making you stay late, give us their number and we'll have a word with them :)
If you are unable to attend one event but would like to go to another, you can transfer your tickets for a transfer fee from the MyAccount section of our website.