Which countries celebrate Independence Day twice in a year?

According to this 2021 article: Belarus(3!), Brunei(2), Cameroon(2), Slovakia(2), Turkey(2), Philippines(2), Libya(2), Lithuania(2), Latvia(2), Laos(2), USA (2), and Mexico(2). There may actually be others depending on how you define Independence Day but that's at least a starter list.

https://www.chicagotribune.com/2021/05/26/these-countries-have-multiple-independence-days/

There are many inconsistencies in the above list.

For example, Cameroon gained independence on 1 January 1960, but does not celebrate this date, instead celebrating a so-called National Day on 20 May to commemorate the 1972 Cameroonian constitutional referendum. But that doesn't make two independence days.

Libya technically has two independence days: Independence from Italy on 10 February 1947 and freedom from British and French rule on 24 December 1951. But the country only celebrates the latter.

And what is the other Independence Day in the US, besides the 4th of July?

Further reading: https://en.wikipedia.org/wiki/List_of_national_independence_days