Platinum Jubilee events in London

It’s the decennial jubilee for the Queen this year, and lots of events are happening in London to mark the 70th anniversary of The Queen to the throne.
Street Parties
A uniquely royal event in the UK seems to involve neighbours who never usually talk to each other suddenly getting together to block off a street and put out tables and chairs to share lunch.
Your own local area groups will have probably already contacted you to let you know that you are invited (or commanded to attend), but