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What happen in Cincinnati October 20th 1976 ??!
As was stated above, it very probably commemorated the opening of the philatelic window, which used this cancel. It was the way most of the philatelic window cancels are found and explains the cachet.
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It's a thematic of what ????
If you look again quite carefully, the object shown in the cancel is a riverboat. It is an idealized picture; perhaps you would prefer a realistic picture of one. Also, Cincinnati is on the Ohio River and did indeed have riverboat service. So, ships, rivers, Ohio: all are subjects covered in this cancel.
Further, if someone collects very modern US postal history, a philatelic window cancel would actually be of interest. The windows were short-lived, set up even as a separate room sometimes, dedicated to only selling stamps. Very convenient if you just wanted to buy stamps for actual use, too. They did very good business for a time and were even used as a convenient supplier by local stamp dealers.
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You want something thematic from 1976
Actually, no. But it is an interesting coincidence. This is the philatelic window cancel from Philadelphia. I would prefer an EKU which I do have in the collection. Even better would be a provable postally used cover.
This cover is very attractive, but can be considered too much of a fabrication made for collectors. That's not only because of the overfranking, but that the post office is closed. Now there was some event that day where one could get the cancel on a handback basis for sure. Like for people with their $2 bills. Even if there was a mailbox at the event, no mail from it was moving that day. Misuse of cancel.
Come to think of it, there is also a problem with your US/Canada FDC. Do you know what that is?