Yes, I can understand trade shows as I have a bit of experience in that area. I just feel that understanding a profession or race is better done over time. I as a GM typically expect very little until 5th lvl from my players as they are often still defining their characters. I find there is often a vast difference between gameplay styles with a 1st lvl character and a 5th or vs a 20th lvl character.Nothing wrong with doing one-shots on game night. Gives you a taste of a lot of different character options, adventures styles, whathaveyou. It's also pretty much a norm for most convention games, if you go and play at them.
Yes, I can understand trade shows as I have a bit of experience in that area. I just feel that understanding a profession or race is better done over time.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.