UK Holiday On June 15 2021?

The following calendar contains bank holidays, as declared in the Banking and Financial Dealings Act 1971, notable days and other obervances in the United Kindom during Tuesday, 2021-06-15. In addition, as declared in this Act, please note that:

The days specified in this schedule may apply to England, Wales, Scotland, Northern Ireland or all of them.
If it appears to Her Majesty that, in the special circumstances of any year, it is inexpedient that a day specified in this calendar should be a bank holiday, Her Majesty may by proclamation declare that that day shall not in that year be a bank holiday and appoint another day in place of it.
Her Majesty may from time to time by proclamation appoint a special day to be, either throughout the United Kingdom or in any place or locality in the United Kingdom, a bank holiday.
No person shall be compellable to make any payment or to do any act on a bank holiday under this Act which he would not be compellable to make or do on Christmas Day or Good Friday;and where a person would, apart from this subsection, be compellable to make any payment or to do any act on a bank holiday under this Act, his obligation to make the payment or to do the act shall be deemed to be complied with if he makes or does it on the next following day on which he is compellable to make or do it.

Linlithgow Marches:
^[5]^[7] The Riding of the Marches, held in one form or another since the mid-16th century and nowadays celebrated on the first Tuesday after the second Thursday in June, involve young and old in the tradition of checking the burgh's perimeter, including the town's historic port of Blackness. Although today's activities are centered more on the colourful parades through the town that involve bands and floats decorated by local groups, the more ceremonial duties of the Marches are still adhered to and a variety of local groups ensure that the traditions, old and new, are maintained.