Yes they are legal but are meant to be purchased by those participating in the event. Looks like volleyball by reading the thread. They are also only meant to be used during that specific time period.
We purchased event tickets years ago, but my DH was involved in the event. Looks like the OP of the thread got a hold of the info for this specific event ticket and shared it on a very well-known deal site. I would personally not buy tickets like that. Too much at stake in my opinion.
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