Explain to me please what kind of workload it is. As far as I can see (and maybe nearsighted indeed) but all you need to do is to come up with the prompt, write down the conditions of the contest and then, at the end of it, determine the winners by random draw.

For example, here is the site that provides a random draw from any entered number
http://numbergenerator.org/randomnumbergenerator/1-10?sm_au=iTV88gnVjqJF0F4D

The prompt we can select from the daily posts. Anyone can do it, including me.

But maybe I am missing something?