The Queen is encouraging the country to have picnics and street parties to join in the Platinum Jubilee Celebrations. Lincolnshire County Council have a specific Jubilee Celebration webpage where they provide useful information about holding an event to mark the Queen's 70th year on the throne; https://www.lincolnshire.gov.uk/jubilee
There is also a website which is dedicated to the Platinum Jubilee where people are being encouraged to submit details about their parties or events so that others in the area can see what is going on. To spread the word about your fun days of celebrations Events – The Queen's Platinum Jubilee 2022.
These links give top tips and information which you may find useful.
Part of the legal process for the closure of your street at party time is the requirement that a notice be displayed at both ends of the street you're closing at least a week before the day of the closure. However, once you have registered your event with Lincolnshire County Council, they will send you the Notice via the email address provided to them, so it can just be printed off and attached to a street sign pole at the start and end of your closed area.
Please ensure the Notices are legible and in situ on the street being closed for the duration of the build-up of the party itself and remember to take down all Notices as soon as your party is over.