Challenge and category changes are always possible as places are still available. However, you must plan to pay the additional fees related to such a change of challenge. The price to pay will be the difference between the price you paid (the price of the challenge only) and the value of the challenge you want to register on the day of the request.
If you have registered for a challenge on November 10th and wish to make a change on February 8th, we will take into account the February 8 rate to calculate the amount owed.
Conversely, no refund will be made for a change to a less expensive challenge or formula.