In Australia, Queens Birthday public holiday is even celebrated on different dates in different states. Most states, first Monday in June. Queensland, first Monday in October. In Western Australia, it is not a fixed date and the state government chooses a new date each year, but usually they pick either the last Monday of September or the first Monday of October. (WA does have a public holiday on first Monday in June, but that's not Queens Birthday, that's Western Australia Day.)

I maintain that the Fourth of July should be made a floating holiday, on the first Thursday in July, to facilitate 4-day weekends.

So this year, for instance, the calendar would go July 4 (Independence Day, Thursday) - July 1 (Friday) - July 2 (Saturday) - July 3 (Sunday) - July 5 (Monday).

It's not a public holiday in the UK. Some civil servants get a 'privilege day' off, but most Brits don't even know about this.

Depends on the day that people say God ordained her to be Queen?

Given how much of US history already excludes and edits the experience of black Americans, this would be in bad taste.

>Jesus's birth to late December for political reasons.

The Bible says Jesus was born 6 months after John the Baptist. John the Baptist was born within a two week period based of the schedule of John's father priestly duties. Since we do not know the exact year Jesus was born one option is that John was born in June. (His birthday is traditionally celebrated on June 24th.) Six months after that would be December. The idea we know for a fact that Jesus' birthday was not December 25th is just plain wrong.