We did an almost-free registry office thing (the free ones were booked out a year in advance). One witness from each side and a surprise attendee who was literally in town at the time (we didn’t invite friends and family because of family drama and logistics issues).

It was a very sweet event where the registrant and their assistant were clearly hopeless romantics - they told us, true or not, that they had won the in-office ballot for who could marry us after we charmed the intake panel when we went in to book - the historic room was intimate and charming and the party we organised that evening for unsuspecting local friends was a huge success.

All up it must have cost us less than two hundred euros, and was an unutterably perfect day. And our unexpected guest took a great video (which seems to have been lost somehow :-)

For some people, simple and small is impossible to beat!