DLNet - Crew Resources & Scheduling - CQ Bid Packages - CQ Bidding Requirements (Insert Month here) - Click on your category.

At the top of each category it will say how many eligible pilots, and how many are in their early/may/must go months. Using December ATL320A (604/644) as an example, there are 8 pilots, with 7 as may go and 1 as must go. But there are 8 pairings available for bid, which means they'll all be going to training in December.