If you are using 1 device, depending on your hardware it may not allow you to use the same camera in your main RSI event and in ICP. You may get a message that your camera is already used by another application.
Because your camera is important in ICP [your boothmates should be able to see you] you have several options:
-Install a second camera or
-join ICP first and then your RSI event if you have only one camera. That way your camera is going to be used by ICP.