I have to disagree with most of the responses here! This is not a discipline issue! It is a wonderful thing that your daughter is happy and excited to see the people she loves!
Instead of yelling and trying to depress her spirits, trying holding her and talking to her calmly. Help her express her love and enthusiasm in ways that are easier for others to deal with, put please don't punish her for enjoying other people.
Missing a meal or two due to excitement is not really going to harm her. If hunger starts to make her cranky, just have her eat a calming snack in a quieter place. Most likely her enthusiasm will be curbed naturally as she ages. Enjoy it while she has it.
My 3 kids, ages 21, 6, and 3, were all this way. While it can be embarrassing and flustering to me, I've realized most of the others find it flattering and adorable. While you must guide them away from anything destructive, try to appreciate the entertainment! :)