We all have those things we come across and say "I should have thought of that!" A few years ago, when in the exhibit hall for the Houston Livestock Show and Rodeo, I had such a moment.
Among all the tractors, ranch supplies, hot sauces, and other vendors you'd expect, I came across a guy selling insoles. The product was much more supportive than one you would find in a pharmacy but a far cry from a custom orthotic. Plus, knowing his audience, he had some that would fit into western boots.
As with most conventions and exhibit halls, there is a ton of walking on hard concrete floors. Surely the number of attendees with foot pain increases as the day wears on, and there the vendor is to provide instant relief at a premium price...Genius!
As you head off to such a conference, go prepared with either some good insoles, such as Powerstep or Superfeet. If you are already experiencing foot pain, see your podiatrist for relief before you go and do all of that walking.