We were in maximum lockdown at Easter anyway, so pretty much irrelevant when the event itself arrived. Preparations had undoubtedly been made, such as Easter Egg hunts, and some may have been holding out against cancelling in the thought that lockdown really was only going to last three weeks. The level of disease around Easter was somewhat higher than it was around Eid, even in the areas of 'growth'.
I suggest that people already in lockdown mode can carry on doing so, for just a little bit longer, without much trouble. Those who have been substantially released from lockdown may find a sudden reversal rather more difficult.
I do hope that, when people realise they have been duped, as their celebrations were not legally curtailed, that any ill feeling is directed at those who seek to deliberately divide society rather than those who are simply caught up in the situation.
UPDATE
Legislation now published. Made at 0900, laid before parliament at 1230, comes into effect 5 August. Party until midnight then. SI 2020 828.
Sorry residents of East Lancashire, Greater Manchester and West Yorkshire lying within 'the protected area'. You've been tangoed.