Tickets may be purchased upon arrival.
You may purchase the day you plan to visit. I purchase the member package for my husband online. It was worth the money for the perks you receive. If I had purchased the day of the visit there was an additional gift. We visited the weekend before Christmas and there were very little visitors
Tickets are purchased on day of entry. They are valid the day of purchase and the following day. Daily, the last ticket sold is at 5:15pm. HOF closes at 6:00pm. It is recommended that you allow 2 hours to view the contents of the museum.
I suggest you purchase in advance, to avoid any confusion.
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