There no less then 3 podcast out there that would give STO idea as which to pick. Having them 100% random would be bad but I do not think STO is that dumb. I am sure they will pick the mission so that console mission and grind mission do not get to be a UCG event
I think what should happen with say a random UGC picker. it will randomly pick UGC in the list and highlight them and if u do that mission then u get a bonus but say if the event runs for 2 hours every 10 minutes another one is randomly generated. The 10 minutes start after u turn it in.