The first emperor of the Han Dynasty declared himself as the son of Red Emperor. Starting from this legend, the red color became the main theme of different celebrations and festivals. This theme also became the main color of wedding invitations. One may doubt that why gold and yellow were not adopted as main color of wedding invitations, as it can be always seen in traditional Chinese palaces. In fact gold and yellow are also meant to be something lucky and joyful. It is also interpreted as a symbol of the royal family, or the emperor. The only one who could use these colors is the emperor. This forms the reason why gold and yellow colors are not the primary colors of a wedding invitation. However, culture is changing from time to time. More people start adopting gold and yellow color the Chinese wedding invitation designs.
In olden times the bride's parents paid for the wedding so the invitations would be issued by them, but now it could be the couple themselves or both sets of parents who are paying, so you'll need to agree between yourselves who is to issue the invitations.