The comic book industry is probably my area of expertise mainly because I get to work with a lot of the writers and artists every year to help raise money for the charity I work with named The Hero Initiative. I am on their Regional Board and what I do is handle setting up at conventions and recruiting volunteers to help run the tables and watching the lines and selling product. We have artists and writers drop by to do signings and sketches for donations.
But I also get to meet a lot of celebrities at these same conventions so it is all good. But I pay my own way and don't get reimbursed for any of my expenses.