After Covid Social Event in 2021?

In 2019 we had an open day that was well attended. At the time a group of allotment members met regularly in the months leading up to the event to plan and organise the event. In the days before the event, members prepared the site filling in holes in the track and putting up banners, whilst ferociously selling raffle tickets in aid of the supported charities. On the day some members opened their gardens, others sold yet more raffle tickets, others manned BBQ and plant sale. It was a great day!

We are considering what social event we may organise after the lockdown restrictions have eased. Questions assume that the event organised will be in lines with government guidelines and rules at the time of the event.