First 24 hours after opening ... entry restricted to untitled dogs (not yet MH).
Next 24 hours ... entry restricted to dogs not yet qualified for MN.
Unrestricted after that.
This would give priority to those seeking the baseline title, no distinction between pro or am. Secondly, this gives everyone else a 24-hour "heads-up" after the initial opening so everyone has a fair shot to be ready at their keyboards for the big entry surge.