On the specified dates, I will use @FairlyRandom to draw one or two numbers between 1 and 100. (To keep things interesting, I will draw two numbers on the final day.) At least one of these five numbers will be the median. The day on which it is drawn will resolve as YES or a percentage if multiple days apply.

Example:

Day 1: 30

Day 2: 59

Day 3: 99

Day 4: 30, 27

The median is 30, both Day 1 and Day 4 resolve as 50%, the other option resolve as NO.

I will aim to draw the numbers between 11:00 UTC and 21:00 UTC on the specified days. I might run some tests and will give a heads-up in the comments.