Below is the main entry into Red Square. If you walk through the open archway on the right, you will get to the entrance for the Symposium. The entrance to the State Historical Museum -where the bulk of the exhibition is housed- is in the building to the left of this main Red Square entrance.

This is what the main entrance to the Museum for the Innovative Costume exhibition looks like:

You will see this poster on the side of the building from the Red Square side:

This is what the main entrance to the Museum for the Symposium looks like. It is just inside the entryway into Red Square to the right:

This sign will be to the right of the main door for the Symposium: