I have to travel a lot to conventions where we are exhibitors, so wrinkle free is important.
One emergency trick I have used is as follows:
Spray with water (you should always have at least a small spray bottle in your stuff, even if you have to empty something out of it into a cup and put it back later), then use hair dryer and hand to smooth out wrinkles.
Of course, a travel iron is handy, but heavy in luggage you are watching the weight of.
The spray bottles of water people keep talking about work so well in the heat, especially if you put a little Sea Breeze or other astringent in the water.
Fishing bass tournaments in the heat, we ladies use this a lot for a quick cool off before the weigh in or through the day.