Okay, since I just spent the last five minutes typing you a response before you DD'ed, I'm going to post it anyway. So here you go:
I would definitely say that you should not throw a welcome home party. Homecomings are a mixed bag of emotions for you and your spouse - you are very happy to see eachother, but more than likely YH is sleep deprived and exhausted. And as much as you want things to "go back to normal" as soon as you see eachother, the reality is that reintegration takes time, even for the strongest couples. You have both been on your own schedules and living different lifestyles. Those first few days together should really be just about you two getting used to one another again.
On top of all that, it is difficult to say at this point (since YH is not home yet) how he will handle reintegration. You need to be very patient and understanding with him for the first couple of months. It is normal for service members to have quirks after deployment, but they usually fade after a bit. Things like not wanting to drive, be in crowds, go to fireworks, shop at a mall, etc. are all things that he might have trouble with initially. Just be ready to take things one day at a time. Everyone is different, but I would err on the side of caution, and do not bombard YH with a party and lots of people when he first comes home. And if you don't heed my advice, please do not throw him a surprise party. I can almost guarantee that would be a very bad idea.