Possible Clues:

• National Chicken Mo.
• Patriot Day mo
• Two before Nov.
• Another 30-day mo.
• End of the 3rd qtr.
• Mo. that always begins on the same day as Dec.
• Acct. akin to an IRA
• Michaelmas mo.
• Wm. H. Taft was the only U.S. president born in this month
• Virgo's mo., maybe