Considering this isn't the first April Fools event to be notification-heavy I think it'd be a good idea to opt out of April Fools altogether. I know a few people who kinda struggle with April Fools on different sites 'cause it's either overwhelming with all the visual stimulation/disorientation and/or hard for them to discern jokes from sincerity so it might be worth looking into
Or to just opt out of all event-theming, so event-specific reactions and visuals like splattered posts would be turned off. I remember space camp initially had its own colourful site theme that for me was very eyestraining since I have pretty sensitive eyes, especially with screens, but thankfully Jeremy made it optional.