For streets wishing to host parties to celebrate the Queen’s Platinum Jubilee, please see the following guidance from Herts County Council (HCC). 
HCC have requested any street closure applications for Jubilee street parties to be made by 21st April 2022, as per this link. .  

Guidance on hosting street parties may be found here:
For streets wishing to have smaller events, there are Street Meets, which don’t require road closures. Please see the following for further information
Michael Gove has asked Councils to be co-operative!