Hi! They usually take a space in the makeup area or have a conference type room that they do the seminar in. All the ones I have been to at Macy's or Nordstrom there have been maybe 30-50 people so you can usually see all of the demonstrations. From my experience they usually take one or two people to demonstrate on and will pass around the products they are using for people to test. Hopefully this helps a little and have a good time! I love going to the seminars as they usually have quite a few good tips.