QKO

I wouldn't worry too much about taking copies of your business license. First, you needed to present it to get credentialed at the show, and all the vendors know that.

If you are establishing accounts with new vendors while you're at the show, I've never run into one that wouldn't allow you to send it retroactively. I make up a .pdf file with my BL and tax ID form, have it available to email from my smartphone instantly if needed.

Besides being prepared for a long day on your feet, make appointments in advance with the vendors you normally do business with. Don't make too many appointments in a day, and don't make back-to-back appointments, as appointments tend to get off-schedule easily.

Don't buy any big-ticket items or make any big service commitments at the show unless you've thoroughly researched these in advance. (Things like a new POS system for your store, or a new website vendor agreement or somesuch).

Have an open-to-buy list with you, or some other method of determining in advance how much you are spending and what you want to spend it on. It's too easy to get caught up in the excitement and over-commit.

Get plenty of rest, don't overindulge in food or drink or partying in the evenings.

Pack a lunch and get in line early for Sample Spree, if you're attending.

Have fun, and spend some time networking with other shop owners.