On this day, the Queen Of The World was born. People were so happy that they celebrated with fireworks the following day.*
And so we need music worthy of this Royal day. Henry Purcell adapted Shakespeare's A Midsummer Night's Dream into a demi-opera. This piece is disturbingly appropriate to this day: today is the mid point of the year; the music is about a Queen; the Queen was going to marry a donkey (ahem!).
And so if you were to hoist a toast to the Queen (or even launch some fireworks), she will smile her royal smile in thanks.
* This is the origin of the moniker "Queen Of The World". She told this to her kids when they were growing up.