It is better to update the same race calendar entry every year but if you have a duplicate event you should delete the newer of them. First sign in then click on the edit tab of your race. You may have to click on the heading to make sure you are at the full event listing and not the teaser introduction. At the very bottom there are 3 buttons preview, save and delete, click on the delete button. You will then be asked for a confirmation click yes and your race is deleted.

If there are required fields that are blank you will need to add at least one character to that field to delete that event.

If you did not submit this race in the first place you will and do not get the edit tab, you have to leave a note here to get the author changed for you