There are a few tricks that genuinely help your hairstyle hold up during an outdoor event in humid weather. One is having your hair cut in long layers with the ends thinned out beforehand — it makes the hair less heavy, so the wave or curl lasts longer.
If you have thin or short hair and want extra volume or length, clip-in extensions are a great option, since we can place them exactly where they're needed.
One thing worth knowing ahead of time: right after your hairstyle is finished, it will look a little stiffer and more done than expected. But the moment you step out of the AC and the wind hits, that natural movement, softness, and relaxed, effortless feel will settle in on its own.