I would suggest that as being a bridesmaid is likely to be fairly stressful, you will be eating unusual food (or cake!) at unusual times, that the libre would be an ideal tool to use, as I think if I was in your situation (unlikely, I'm a man, but I can dream!) I would hate to be without mine as my bloods would be all over the shop. At least with a sensor on your arm you won't have any danger of leaving blood on a bridesmaid dress! Yes, the Libre isn't always spot on, but the trend arrow is normally accurate, and will let you know what general direction you glucose levels are heading in. It tends to be that the level shown is what your blood glucose was perhaps 15 or 30 minutes before you swiped, but you get a line graph showing your levels every 2 minutes for the last 8 hours, which gives a good idea of what is going on. If blood glucose is either very high or very low the reading on the Libre will not be as extreme, but you should know by how you feel that something's not right. I'd say go for it, people will be intrigued if they can see it, and you'll soon get a good story ready about what it is.
By the way, I've been using the system for a good 18 months now, and I wouldn't like to be without it.
Another thought comes to mind - those of people at the wedding that you already know should know that you have diabetes, so explaining the improved technology to them should be easy, don't be embarrassed or super conscious of it, just let them be impressed.
Let us know how you get on!