Whatever you do, remember he
is only a year old, so don't overwhelm him with too many unfamiliar people, lots of noise. I know I made a big deal on my firstborn son's and damn near scarred the kid for life!
It
unintentionally turned into an 'adults having way too much alcohol and way too much fun' party thanks to my (ex)husband deciding on his own to invite all his buddies from work.
I think we forget that very young kids don't do well when they are 'expected' to have fun, especially when we turn their normal routines upside-down and they let all know it's NOT working for them. The suggestions of keeping it small and quiet(er) are on the right track. Whatever you end up doing, keep your little guy's contentment foremost and enjoy it, momma!