$3k is a nice price pool but I doubt members will take this seriously. What should make forum members not to think that the entire stuff is gonna be like cryptomus's campaign or some other scam scheme? If you are really representing SportScore, with a legit contest of this nature, why not get a reputable member to organise it Also with probably an escrow.
I'm a designer and it won't me funny wasting time on a logo that would be likely stolen or won't get it's worth.

Anyways good luck   and if it turns out to be real I'll definitely participate.