Try WMFD.com (price drops) for $12 adult tickets
ONLINE 2019 Child 5-12: $7.50 Adult: $19 Season Pass: $69 FRONT GATE 2019 Child 5-12: $9.50 Adult: $23 Senior (front gate only): $21
September 28th and 29th has a super deal for entrance if you buy online https://www.bigtickets.com/e/renfestival/ohio-renaissance-festival-2019/
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