Canadian Hams are Authorized Special Prefixes to honor the 70th anniversary of Her Majesty Queen Elizabeth II’s accession to the Throne (Platinum Jubilee) – VG, VX, XK and XJ prefixes may be used between May 15 and July 14. There will also be Canadian Special Event stations with special callsigns.
RAC.ca

Hams in the UK may use a /70 suffix, or GQ, MQ or 2Q prefix, plus to individual and RSGB Special Event stations and events.
RSGB.org