It cannot be for 'foreigners', Jean-do, as Britain is packed full of them. Can I say that these days or do I get arrested?
I believe there was a Microcar date list plus loose other details posted on this very website. Sadly most events are down the East coast of Britain and the nearest to Kent is probably Great Yarmouth. Suddenly France does not sound so bad. You could go Dutch but they tend to expect some serious mileage to be covered. Famously a Peel Trident and piloting couple drove to one of these, took part and returned with only minor drama. It is certainly not an event for sitting in deckchairs. We are now in the loop for Belgium next year. Our near European chums are providing a great selection of offerings and it is a source of frustration to me be so disorganised to not attend.
Otherwise I think you are looking at your local county type shows which might attract a group of Micronauts, Bromley has gone I think. Kent is too awkward a place to get to from here, given my proximity to 360 degrees of events, so I could not say what others your local guys go to.