If you're in the midst of planning a wedding, you'll probably come across a guest or two who makes an odd request or does something inappropriate or downright rude . Well, you may know the ins and outs of wedding etiquette, but many people don't. So TheKnot.com has some tips for how to deal with guests who don't know jack about what's acceptable and what's not:

1. Not sending RSVPs. Anyone who's ever planned a wedding knows the importance of RSVPs -- from making your seating chart to ordering enough food. Unfortunately, some guests don't realize the RSVP is a necessity.

How to deal : Give it a week, then give the guest a call. Ask your maid of honor or best man to help with phone calls, if there are a lot. Or send a group email (using blind CC) saying you need to know by a certain date if they're planning to come. Be nice, but firm.

2. Sending RSVPs with extra guests. Sometimes a guest responds that she'd love to attend ... with a person you never invited or maybe never heard of. This puts everyone in an awkward position.

How to deal : Call the misguided guest, apologize for the misunderstanding, and tell her/him that unfortunately the limitations (a small space or tight budget) require a strict guest list.

3. Showing up late. We all know some people who are perpetually late -- whether it's to work, parties, weddings or whatever!

How to deal : Ask an usher or your wedding coordinator to hang out near the rear of the ceremony site so they can make sure the ceremony goes undisturbed by helping your late guest find a seat -- quickly and quietly!

4. Giving unexpected toasts. Weddings can be emotional events, and toasts are an opportunity for those closest to you to share sentiments with the rest of your guests. Those same emotions can make some people feel compelled to grab the mic when they weren't asked to toast.

How to deal : Unfortunately, you need to just grin and bear it. If the toast seems like it'll never end, have the best man signal the band or DJ to carefully cut in. Head off unplanned toasts by making sure your DJ or bandleader has a list of approved toasters.

5. Requesting songs. You've worked with your band or DJ to put together the perfect soundtrack for your evening. Then, your ambience is ruined when someone requests a song that's totally not on your favorites list.

How to deal : Requests from guests may be inevitable, but telling your bandleader or DJ beforehand that you'd prefer they not take requests is a good start.

6. Drinking too much. A few too many cocktails can turn any guest from the life of the party to a bit of a mess.

How to deal : It's not your responsibility to babysit your guests, but you can grant the bartender permission to cut off anyone who's had one too many. And make sure no one drives drunk -- ask someone to call a cab for them.