If Xue Yan and Fu Ying didn't have any objections, then the two countries would carry out these action plans.
A day or two would not be enough for a solid plan to form. Therefore, Xue Yan ordered Xue Wufu and Shao Zhongxi to bring Fu Ying and her people around the capital city to have fun and experience the prosperity of the capital city.
If the diplomatic team had free time, they would bring the diplomatic team along for a tour.
It was not rude of Beicheng to send two princes.
As for Xue Yan himself, some matters in the capital city had nothing to do with Beicheng. Therefore he had to personally handle them. Whilst the people from Beicheng were busy, he naturally took the opportunity to deal with these matters.