Asked to provide a cardmaking workshop

I do a sort of cardmaking workshop a couple times a year with a few friends. There are usually 3-4 of us that will make up a card idea and kit together the materials. Then another 5 or so come and we have a crafty afternoon. We keep the number small, so it's not a ton of work - at most you are kitting up to 10 cards.

The Sheet Load of Cards idea is a great one, we have done a few of those.
Once we did stenciling (two of us had the same TE Create in Quads stencil and we setup stations for folks to stencil) and had an assortment of sentiments.
I usually do a die cut heavy card.
One gal has a zillion rolls of washi tape and we've done washi cards (select colors and cover the panel with strips) and add a sentiment.
One gal loves to stamp and will stamp and bring some basic alcohol markers and a bunch of stamped/cut out images and card fronts/sentiments. I think that's more challenging, since it's harder to share the markers.

We ask folks to bring basic supplies if they have them. Some come with a few things, some come with everything they need and some come with nothing. We just pass around and share as needed.

First, a couple of questions: is this a convention, or more of a local craft fair, and will anyone be staffing your booth while you teach the workshop? Do you have a store associated with your booth that means staff at the store can help do the prep work for the class(es) you teach?

Typically, when I have gone to a convention when some of the booths teach customers how to make a card, there are others staffing the booth. If you are the only one staffing your booth, then the class may cut into your sales since customers won’t be able to buy during your teaching time. Also, if no one else is staffing your booth, you may have some shoplifting during that time, even if the teaching is AT your booth, because you will be distracted. Even if this is a local craft fair type of event, I’d be hesitant.

I taught a card class once a month to some gals in my area. Typically I prepared kits for 6 to 8 people, and it was a TON of work! (Maybe because I tried to make sure they learned something each time and we made 3 different cards each time.) For an event, the prep work would presumably be far worse. In fact, I know it would be, because I used to prepare the card kits for the LSS when they set up at a yearly convention. I got paid to do it, but if you don’t have someone else helping you, it will be overwhelming.

People who do Make and Takes don’t necessarily buy anything from you, although some hopefully will. If you don’t have anyone to help you do prep work, then I would say no to teaching a class.