@Shelovesamystery - yes, I wish they'd do number of households too, and even if they can't easily open up events to large groups of people just yet (as my understanding is you risk creating vaccine-proof mutations if a big mix of vaccinated/unvaccinated people get together in the same place), I'm hoping they'll allow greater numbers of vaccinated households to mix together.
Meeting outside makes sense as there really is little risk as long as you stay outside and don't get tempted to 'pop in for a minute'.
TBH, I am tempted to say we'll go to IL's over Easter as they have had first jab and they almost certainly had COVID at the start of the year (never tested, but SIL, who is in a bubble with them, got + test about a week after they started feeling better) - the risk seems minimal, certainly if it's just us and them.