Fealty to God always overrules human respect. Logically, what's the occasion of the after-party? Would it be happening if not for what happened earlier that day?
If you'll be part of the farce of a small child being led to believe that Our Lord was fittingly received in an utterly unfitting manner, then your presence condones the preceding sacrilege. This holds whether or not you believe that the Sacrament is validity confected in the NOM. What counts for your question is what THEY (adults included) believe, and thus what you'd be going along with by your physical presence. Is socializing at such a gathering really worth it?