Each exhibitor's stand has a Jitsi video meeting facility embedded. See the black frame in the picture above circled.  Click on it and the following screen with pop up.

 

Ignore the Chrome suggestion to install an Extension. Enter your name as you would like others to see it and click on "Join Meeting". Unmute the audio and allow camera/video to operate. 

 

On joining the Jitsi video meeting you will see the other party/ exhibitor's representative in the small video frame in the corner and your own image in the centre.

If your camera is off, you will see your name initials as seen below.