Re: D&D 5e Archery Contest
As far as scoring goes there are generally three targets for archery contests, near, far, and out there. Making those be shots taken with advantage, normally, and with disadvantage will make the competition fairly easy to manage as then you need only one scoring system.
I would suggest at most 5 brackets of score. 1 bulls eye, 3 concentric circles, and the outer target worth 1, 3, 5, 7, and 10 points. DCs should be 8+character level for the target, +2 for each circle, and +5 for the bulls eye. So if you do a 5th level game that would be DC 13, 15, 17, 19, 24.
With advantage you will get several high results, and with disadvantage you should still get target hits most of the time, but nobody is going to be getting all bulls eyes or missing every target so luck will be a factor as well as skill.