Extract from DCMS website

DCMS is encouraging local authorities to licence public spaces to enable a range of events to take place. This is so performers and entertainers would then have no need to obtain a separate premises licence, or give a temporary event notice themselves to give a performance in these areas, so long as they had permission from the local authority to use the land.

A list of available open spaces already licensed is here.

A list of places already licensed

See here

Encourage your local authority to do the same.