4:30 Vs 6:30 Wedding

I don`t know what you mean by "flying by". All weddings fly by, no matter what time they begin.
A 6:30 wedding is dinner time and so a full dinner should be served.

What you listed for appetizers would be considered light appetizers. Heavy appetizers would consist of various passed hors d`oeuvres and several stations with heavier foods. Whether you go with heavy or light, I would say that it`s better to do that at an earlier afternoon wedding, around 2 or 3 o`clock.

I would say have it any time you want, but if you`re going to serve only those apps you listed (which are fine choices by the way) than state so in your invitation. Say something along the lines of "appetizers will be served" so people are aware of the event not being a full meal. That way, people can either come haven already eaten, or at least know if they`re really hungry to get as many meatballs as possible!! And 6:30 is not too late. In fact, it`s an evening wedding, which can lend itself to many great photo ops and gives the entire thing an enchanted night-time feeling. Good luck!

I really wanted to have my wedding on Sat. Evening, but I realized that meant I would have to serve a full dinner. But about a week ago my fiance and I came up with a great plan to push the wedding back until about 7pm and serve all type of desserts at the reception. This way everyone has already eaten dinner, to make sure there is no confusion tell friends and family so they can spread the word.

No need to spread the word. Put a corner copy on your invitation (or a separate reception card) stating "Dinner and Dancing following ceremony", "cocktail reception", "dessert reception", etc. You get the idea.
I think cocktail reception should be either afternoon or later in the evening, not dinner time. But as long as you put it in the invitation people will know and be prepared. The only thing is just to make sure that if people are going to be there for five hours or so that they get enough to keep them from having growling stomachs. I mean you don`t want them to be dying of hunger and leave your reception early just cuz they can`t bear the hunger any longer. It doesn`t sound like that`s going to happen at your reception, just keep it in mind though.

We are having our wedding reception following our wedding which starts at 6:30. So dinner will be served at 7:45 and all of our family and friends like the idea.

We are night people anyway and so are our friends and some of the family.

If you`re wanting to serve a light menu then you should plan your Wedding at 1:30 in the afternoon. Then you could serve Light foods at that time.

I agree. Anytime between 5:00 and 7:00, a dinner should be served. If you expect your guests to munch on appy`s all night and stay for dancing, it`s not going to happen. If you start early, appy`s a great, but keep in mind that people need to sit to eat and will leave to do that if you don`t provide anything. I would just consider if you can`t afford meals is starting your reception late (7:00 - 8:00). Then people shouldn`t be expecting dinner. You should also state this in your invites as well.