Don't leave early. Your guests came from near and far to see you on your wedding day. Not staying the whole time of the reception would be a slap in the face. This will be the only time most of your family and friends will be able to see the bridal couple, as they will be very busy with last minute preparations the days leading up to the wedding.
Setup all the tables. Your wedding vendors will need to know where to set-up. Be sure there is a table for the wedding cake, music entertainment, catered food, sign-in near the entrance, gift table, tables and chairs for all your guests to eat and any other tables you may have planned for specialty items.
Preplan with your vendors a day or two before the wedding. Be sure all your wedding vendors know exactly what you want. Clarify times and location so you don't need to worry about them.
Don't arrive late to the reception. It is customary that guests do not start eating until the bride and groom start the food line. Be sure to get as many of your pictures taken before the wedding. There are many ways to accomplish this. One is to have the entire bride's family pictures taken. Then, have the bride return to the dressing room. Next, take pictures of the groom and his family as guests can see the groom before the wedding. This way you will not compromise the groom seeing the bride before the wedding. Therefore, all that is left after the ceremony are pictures of the happy couple.
Don't seat the young at heart directly in front of the music entertainment. Older generations are at a wedding typically to socialize with their family and friends. If they cannot hear each other talk, an unhappy situation may occur. So, if by choice, seat the young at heart near the wedding party but away from the entertainer's speakers.
Don't have one particular type of music. There are many different types of people in the world. And yes, they include your family and friends. For example, the bride and groom may love country music. It doesn't mean you have to play country music the whole night. There is a lot of celebration music besides what you like.
Start the food line or meal as soon as possible. Guests plan their meal times the day of your wedding around your reception. Guest will not eat a big meal before your wedding because they know they will be eating at your reception. Don't starve them.
Know what it will cost you if the reception goes into overtime. Ask the reception facility exactly how long you have the hall to rent and what time you must be out. Please allow time for cleanup if you are the ones doing it. What is the overtime charge for the facility, music entertainment, photography, etc?
Greet and say hello to all your guests. Finally and most importantly, greet all your guests. Make an effort to have a conversation with each and every person. They are there to celebrate your marriage. Give them the common courtesy of thanking them for coming to your wedding.
Don't get drunk and obnoxious. Keep in mind the only time brides and grooms eat during the wedding day rituals are at the wedding reception. There's not much food in your stomach and alcohol will affect you much faster. Try and eat throughout the day and watch how much you drink. You want your guests to remember how beautiful the bride looked, not how you acted.