When these overwhelming feelings of rejection come on, remember you don't know why the action occurred:
It is possible they forgot to invite you.
It is possible that they sent you an invite through social media but the internet ate it. ;-)
It is also possible that they prefer to hang out with you and your husband in a different setting (less family, different friends, more quaint...)
These are all just speculations. So, perhaps you just aren't supposed to be at this event?