 Tickets for America's oldest county fair now on sale. The 206th Topsfield Fair runs this year between October 4th and 14th, and advanced admission and ride tickets are available right now. The advanced tickets are offered at a discount and are good for any day during the 11-day run. There are three-day tickets available and discounted ride tickets also up for grabs now at TopsfieldFair.org. Rain on our parade.