Oh, so it's only sort of for the guests. A disposable-professional thing. Fair does. I think I've only been to one weeding since my own, and that was around 2010 and definitely didn't have such things. It didn't have much food either, but that's a different story.
I've never been to a hen do but I almost got roped into one back in February 2020, and I didn't even know the bride! Her mother and some friends grabbed me as I was coming out of a cafe and asked how to get to "Cozy Club" on Corn St, so I showed them to Corn St and they tried to get me to go in and get drunk with them. But hey they'd only come from S. Wales and Swansea to Bristol for a hen do makes more (or is it less?) sense than, say, Prague or Ibiza. I don't know if they had cameras, disposable or any other sort, but at least they didn't try to take any photos of me.