It is a very quiet month for philately due to the Full Movement Control Order 3.0. The first “event” would be a minor Palindrome date. The Palindrome date is on 12 June 2021 (12.6.21 or 12621), a Saturday. Sadly due to the Full Movement Control Order 3.0, the post offices are closed on Saturday.
There are 3 more minor Palindrome dates for the year:
12.9.21 (Sunday – need to look for a shopping centre post office)