Talk

We had quite few people do things for our wedding...... someone drove us in his nice car, someone made the wedding cake, someone made my dress, someone else made the bridesmaid dresses, friends did the flowers, and so on. Others gave us gifts of their time/skill for our home.... someone built a patio for us, someone else did the flooring in the kitchen .
I loved it, and remember all those gifts rather than who gave us the casserole dish or colander.
I think you just have to be really organised with lists or spreadsheets, or - preferably!- delegate other people close to you to co-ordinate particular bits of the day...... your parents, siblings, or friends or of course your dh2b's side.... you'll know their capabilities and how much you can trust them, or how much they'd like to / not really want to. Someone to be in charge of the practical things like putting up the marquee, arranging the seating, arranging the toilets, lighting, heating (?)...... someone to co-ordinate transport.... someone to co-ordinate offers of food...... etc. For a big 'do' like that, it might be a lot of work to do on your own without much help.

Thank you BackforGood! That's really helpful. Sorry it took me ages to reply.