In Vermont’s NEK, the Caledonia County Fair is a big deal.  Not only is it the oldest fair in Vermont, but for many NEK Moms the fair marks the close of summer and the welcome to the back-to-school rush.  For many kids, it’s the opportunity to catch up with friends and enjoy five action-packed days spent eating “fair food” and enjoying rides and entertainment. If you’re planning to attend the fair or thinking about going, here’s a quick guide to what’s hot for moms and kids in 2010: Save 20%:  Moms can get their hands on discounted admission tickets ($12 vs. $15 at the gate) if bought in advance at Dad’s 4 By, Lyndonville Agway, Northeast Collectibles, and North Country Federal Credit Union.…