Most couples can't wait to celebrate one of the most special days in their life with the people that are the most special to them: their wedding guests, duh! With that said however, there are a few things across the board that friends and family unknowingly tend to do to create unnecessary stress for everyone, particularly the bride. You may not get just how annoying some of these things are now, but once you're engaged you'll understand.
1. You forgot to RSVP on time
Or you can't come so you figured there was no need to mail that response card back at all. Not only is this inconsiderate, it puts couples in a weird situation. Say you send your RSVP in a few weeks past the deadline, and they've already invited someone else to come in your place or adjusted their budget accordingly? That's awkward...
2. You assumed you had a plus one
As much as you wish you could bring a hot date to the wedding, brides wish they could give you a plus one. If only money grew on trees and it were in the budget, they'd be all for it. Unfortunately, the guilt trips don't really help your cause.
3. You never said your plus one couldn't come
The cost per head at a wedding can be up to several hundred dollars, which means you forgetting to inform the bride that your plus one couldn't make it after all winds up wasting money she may have wanted to spend elsewhere (or not at all!).
4. You neglected to check the wedding website
There's a wedding website on that save the date for a very good reason. And if you'd actually read it, you might have seen something along the lines of: "For additional information on our wedding and travel accommodations, please visit...". So before bombarding the bride with a billion and one questions, visit that website, and you'll likely find the answers you were looking for there.
5. You decided to buy a wedding gift that wasn't on the registry
Because it's more personal and what better way to surprise the happy couple, right? Er, wrong. While any gift is obviously appreciated, do keep in mind that a registry is based off real needs and the bride and groom's own style (it also helps to eliminate the issue of duplicate gifts). So unless you know them well enough to know that they'll have room for it and either love it or actually use it, stick to the registry, please.