[CheshireTheCat]

If one counts ten days from 11.4, the tenth day is 11.13.2020, a Friday, the sum of the digits of which is 10.

The only interesting historical event I can find tied to that date is the St. Brice’s Day massacre in 1002 when Æthelred II, The Unready, killed all the Danes in England.

[ichabod1]

who ever said you can never get rid of the Dane?

[numberonepal]

If one counts ten days from 11.4, the tenth day is 11.13.2020, a Friday, the sum of the digits of which is 10.

That is Friday the 13th.