Child free weddings seem to be more of a modern phenomenon. Ive been to lots of weddings, I don't recall ever going to a child free wedding.
Not modern at all. I never went to any wedding my parents were invited to in the 60s or 70s. Each wedding is individual but I don't recall children at many weddings I attended as a young adult in the 80s
wouldn’t use a random babysitter
This is always such a ridiculous thing that gets traipsed out on MN threads....... do you seriously think people leave their dc with people they don't know ?
. We used several different babysitters over the years with my dc, but, oddly, none of them were 'random'. Nor are my dds 'random strangers' to the dc they, iin turn look after for other people.
I think if most people around you have kids, then you'd be potentially excluding an awful lot of people if you said no children.
Or, you might assume they would get a babysitter (if they wanted to come) like they would if they were going to the theatre or out to a dinner party, or for their work's 'function', or - in my world - to a funeral. You aren't excluding them. You are inviting them, and it is up to them if they want to make arrangements that enable them to be there or not.
I wouldn’t want to go to a childfree wedding personally because I have young children and enjoy spending my freetime with them. Weddings are dull enough, never mind havin to pay a fortune not to see my children for the day. No thanks!
So, if you as a fully grown adult, who understands what is going on, think a wedding is dull, why on earth would you want to inflict it upon small children ? 
Also all this rubbish about guests relishing in he idea of a childfree night at your wedding - I hardly think so! If we were to have a night without our kids we’d rather spend it alone 💯% not at someone else’s wedding!
Why is it 'rubbish' ?
. Personally, I lilke spending time with friends, having a laugh, getting up to dance etc - can't really have a party with just two of you. It's fine that is what you would choose to do, but it doesn't mean it is 'rubbish' as it is true for lots of parents of young children. Lovely to get out and party without having to be watching your dc all night.
When I get an invite I assume that only the people actually named on the invite are, you know, invited. It's not hard.
^ Quite
I dont feel comfortable leaving my children with a stranger (whom I dont know personally) for an entire day and an evening.
This might come as news to you, but nor would any half decent parent. Nobody is suggesting that. I used babysitters. I also used to babysit (pre-dc) and now my dc babysit. None of these events EVER involved leaving dc with strangers 