Penny Picks: imo a great reason to visit the Trade Show is to actually visit the booth.
If holders do go, *if you aren't offering actual business imo you should go on the last day of the show, that way you won't interfer with their potential business. The wind down of a trade show is usually boring so some may actually be glad to chat with you.
After doing over 30+ exhibit shows with different industries my observation is they are most usually slow near the end, *but very busy the first day or two with accounts or potential accounts.