2. More Throwing Shoes (If Possible)
Throwing shoes are inevitably going to break and wear through and this could happen at any stage, even a competition! To be safe carry a 2nd pair of shoes with you whilst throwing and you will be safe from such a disaster striking.
If possible, make sure they are a different type of shoe. Especially when throwing in a foreign circle it is handy to bring a couple of pairs of shoes with varying grip. This way if the circle is quick and you are slipping you can use slightly grippier shoes and vice versa.