Yes. Rain could be an issue, especially since they are depending on volunteers to provide gazebos and umbrellas.
I just re-read the other posts. These people are in their 40s?! Gee whiz! DH and I had a registry wedding in Chester with his parents and two of my aunts. And a lunch at our hotel's restaurant(which my aunts paid for. It's not monumental, but, they also did pay for their own flights, from Chicago to Manchester, and hotel room in Chester). After which DH's parents went home on the train, and my aunts, DH and I had a small wander around Chester. I bought my wedding dress in San Diego at a second hand shop for $40. I totally want to re-work it for our anniversary in like, 5 or 10 years, though. I digress. Can't believe all of these hoops that yourselves and their other friends are expected to jump through for these pair. I seriously can't wait for the updates now!
Also, I can't wait for updates on the wedding Racheee's attending. Saw the inspiration for it. Don't think it'll work out quite the same way in the UK. But, maybe that's just me.