Jaime is a senior civil servant and as far as I know, still the Dutch Climate Envoy. He might have had some involvement in the (preparation of the) program for the Omani delegation because I can't see why else he would attend the state banquet to be frank. Viktoria is involved in international agri-food policy development, which might also have a link to Oman or the visiting program. Whatever the background it is unusual to see them here. It seems Constantijn and Laurentien are mainly invited when close (family) royal friends are visiting. Margriet and Pieter only join sporadically these days. A pity. A broader representation of the RF looks so much better. Amalia is making up for it these days but has less conversational topics I suspect,