The website was supposed to be the easy part. One link to send people, so nobody had to ask us the same three questions again — where, when, and whether they could bring somebody.
It was not the easy part. So we made what we had been looking for: a page you can put together in an afternoon, with the guest list, the replies and the seating plan behind it, in one place and in our own language.
It held up well enough on the day that keeping it to ourselves seemed a waste. Handfast is that, built properly, for anyone getting married.