Rules relating to permissible activities during the easing of lockdown for covd-19 are slowly changing.
This is the situation as of 4th July until further changes are announced on 22nd July
https://www.gov.uk/coronavirus is the main government site relating to coronavirus which includes the following link to permissible activities
This document states:
It remains illegal for groups of more than 30 individuals to meet. Exceptions exist so long as they comply with the law outlined in statutory instrument The Health Protection (Coronavirus, Restrictions) (No. 2) (England) Regulations 2020
This can include weddings and funerals (which we advise should be limited to no more than 30 people), religious ceremonies and services, community activities and support groups. (sic) will be able to hold more than 30 people, subject to their own capacity limits, although any individual groups should not interact with anyone outside of the group they are attending the venue with – so in a group no larger than two households or six people if outdoors.
Group gatherings within the village hall require the hall management and the activity organiser to conform to specfied reqirements outline in section 5 of
The Health Protection (Coronavirus, Restrictions) (No. 2) (England) Regulations 2020
5.Restrictions on gatherings
5.—(1) During the emergency period, unless paragraph (3) applies, no person may participate in a gathering which—
(a)consists of more than thirty persons, and
(i)in a private dwelling, including a houseboat,
(ii)on a vessel, other than a houseboat or a vessel used for public transport, or
(iii)on land which satisfies the condition in paragraph (2).
(2) Land satisfies this condition if it is a public outdoor place, which is not—
(a)operated by a business, a charitable, benevolent or philanthropic institution or a public body as a visitor attraction, or
(b)part of premises used for the operation of a business, charitable, benevolent or philanthropic institution or a public body.
(3) This paragraph applies where—
(a)in the case of a gathering described in paragraph (1)(b)(ii) or (iii)—
(i)the gathering has been organised by a business, a charitable, benevolent or philanthropic institution, a public body, or a political body,
(ii)the person responsible for organising the gathering (“the gathering organiser”) has carried out a risk assessment which would satisfy the requirements of regulation 3 of the Management of Health and Safety at Work Regulations 1999(1), whether or not the gathering organiser is subject to those Regulations, and
(iii)the gathering organiser has taken all reasonable measures to limit the risk of transmission of the coronavirus, taking into account the risk assessment carried out under paragraph (ii),
Managing a public meeting will requires very strict control on the order in which people enter and leave the seated area, typically the furthest seats from the door are occupied first and vacated last to avoid compromising social distancing rules which will inevitably occur when people walk past seated individuals if the maximum numbers of seats allowed under the 2 meter rule have been set out and are occupied.