If the event is running low, there will be a countdown clock inside where you add or edit the reward for that event. Some events (especially holiday-themed events) have very limited availability for some of the rewards.

If you are already in the race, click on "Races", then "Edit Order" to get to this screen.

If you only want one reward, verify that you have deselected the reward you don't want prior to check out, as the medal is default selected.

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