What's the proper etiquette here?

So the Save the Dates went out - check. We have heard from 3 couples that they will not be able to make it (wheew, we way over booked that flight!). Here's my question: do I still send them invitations?

I don't want it to seem like I am now just asking for a gift but I didn't know if for some reason it is rude not to send the invite now?


Oh yeah, and Happy Halloween! I am working from home today and just realized that I have NO candy. Eeek!