From different reaches of the net, please share what sort of videos or articles you would file under this heading.

https://www.youtube.com/watch?v=wIwucLbMoVU

Commonwealth Day celebrated in church by Her Majesty Queen Elizabeth II and her family featuring cultural presentations.

I'm not sure what you are looking for here?
Do you want links to examples of different cultures?

Being a US citizen I feel very strongly about Native American Indian culture.
But, there are many different cultures in the United States.
All of which are very important to those within them.

Then you have the American culture which is also important.
Often, the lines are blurred.

So, Is there a specific culture you have in mind or are you looking for cultural differences of cultures as a whole?

I lived in Sainte Genevieve, Mo for a few years. That town's culture is specifically French. Town sponsored activities (festivals, events, holidays) baselined in French culture.
http://saintegenevievejourdefete.com/wordpress/
Jour De Fete is an arts and crafts festival honoring the French heritage of its founding fathers.

I wasn’t sure whether to represent my Highland or Irish heritage....I can’t make the link come up.

Okay, try this. It’s Highland reel vs Irish jig.

https://m.youtube.com/watch?v=Wvc_Rykbjsc

Culture is diverse all over the world. There is no right or wrong. I found the Commonwealth Day quite cultural in scope. For example, the downtown art gallery has been leaning towards having a few exhibits geared towards native culture over maybe the last 6 months. The annual Winter Festival has presentations from a few different groups like English, Irish, Ukrainian, Metis, Filipino, etc. This year's displays for the Winter Gardens were considered cultural/creative as well. What you have given looks fine to me. Just go with your gut.

This is an example of what the previous generation of Ukrainians might have enjoyed. This is closer to traditional with a modern twist and it's good.

https://www.youtube.com/watch?v=3w_LLGdPdms

It is music performed for a modern talent show using the cymbala or dulcimer.

This link displays a positive group a relative belongs to (Len is the bald guy on the far right). An accapella presentation by Perpetual Emotion Quartet. Keeps my cousin out of trouble. :o)

https://www.youtube.com/watch?v=V4JQb6ZYLb4