LetsReg enables you to re-use your previous events as a template for future events. From the menu on the left side, select 'Add/Copy' and then 'Copy Previous' to reuse a previously registered event.
You will then be able to choose from any previous event, from a menu which is sorted yearly.
You can then amend the details of the event to match the requirements of your new one, whilst saving time on the areas that do not need to be changed.