One of the main measures the UK government has taken against the COVID-19 pandemic is a series of restrictions on social gatherings. Some of these restrictions have been legally enforceable, while others have just been guidance. In particular, the law and guidance has variously restricted the size of social gatherings, the location (indoors or outdoors), who can attend, and the distance that should be kept between people.

When will government guidance allow indoor parties of any 100 people in England?

This question resolves when it is no longer against the law or government guidance for any 100 people in England to meet socially (for non-essential purposes) in a private place indoors with no physical distancing between people and no face coverings being worn.

'Any 100 people in England' implies that the question should not resolve if only people in a fixed 'bubble' can meet, or if there are any restrictions on travel between parts of England, or if only people with negative tests or who have been vaccinated can have such parties. It should obviously ignore cases such as prisoners who are not allowed to meet others.