The idea of sitting for an event has to do with being grounded, safe, and available for whatever is being presented.
If you dream of an usher, you are tapping into the part of you that can assist in your readiness to receive something of significance, such as new information, or to witness an important shift in your life. [1]
If you dream of being ushered, then you are realizing that you are divinely supported as you move from one rite of passage to another.
2. One should sort out certain things. [4]