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I guess the question I ould ask is whether you gave him advance notice of the party, or simply expected him to know about it? If he had at least a couple of weeks notice, then he should man up and tell his GF that they need to stop by and wish his folks a Happy Anniversary. He doesn't need to stay for the whole thing, but he should make an appearance; there are things you do for family simply because they are family; becaaue you are being respectful and considerate of THEIR feelings.
However, if notice of the party was not given until last minute, then sorry, his plans were already made. It would be nice for him to come by, but without being told ahead of time so that he could fit his schedule around it, ...
His maturity or lack thereof is another issue entirely.