That is a marriage ceremony.
What is written is: Xuan Qing and Zhen Huan have made a lifelong promise to marry each other forever, and may Qin and Se live in peace and quiet in the years of imperial rule
The marriage Geng post is: In the old marriage customs, the names of both men and women were written on the handle. The red Cambodian sticker with the place of birth, birth date and the names of the three generations of ancestors is called "Geng Tie". Men and women exchange Geng Tie to express their proposal or engagement.