I usually post things that are more for the bride or groom but this is more for the wedding guest. Its full fledge wedding season so if you have some summer weddings to attend here is some advice.
1-Get a gift off their registry and shower the happy couple with gifts they’ll love (and picked out!) They might really need that new set of dishes or the entertaining server set. When in doubt money is always good.
2-Don't bring the gift to the wedding. You should have it sent directly to their home. Nowadays it is so much easier with online registries and why would you want to lug that gift to the reception?
3-Please think about what you will wear to the wedding. Women please don't wear white, save that for the bride. Men please don't wear kaki pants and a golf shirt(unless its a backyard bbq). Try to dress up a little. 9 times out of 10 a nice dark suit and tie works just fine.
4-There is no need for you to tip the bartenders at this wedding. The couple has already taken care of this and I promise you the staff is well taken care of. Put the $5 bill back in your pocket.
5-and last but not least please let the bride and groom eat their dinner. I know I know you want to see them, hug them and tell the bride how great she looks but can you give them 20 minutes to eat some of the meal they painstakingly picked out for their wedding?
NOW GO AND HAVE FUN!