In This picture you can see a Cao Dai ceremony. As you can see, this is a colorful religion. The temple is decorated in gaudy colors.
Before the ceremony you are allowed to visit the temple. You can take pictures. Monks will tell you what you can do, and what parts of the temple you can visit. At twelve, you will be invited to climb the stairs. From the balcony you can see the prayers ceremony.
As in most temples in Vietnam, you have to leave your shoes at the gate.