Dealing with Heat, Humidity, and A/C

Like much of the country, we're experiencing quite a heat wave (at least by northeast standards). It's also going to be very humid. On Saturday, I have an outdoor ceremony followed by an indoor reception.

Not having ever been very good at science, please help me better understand what I need to do to manage my gear in such a way that condensation doesn't put the brakes on me. If I take lenses from the A/C out into the humid heat, that's when it fogs up? Or when I take it from the humid heat into the A/C? Or both?

Between primes and zooms, I have some redundancy and will probably set myself up to have indoor and outdoor lenses on Saturday, but thoughts about how to manage this challenge?

Cool Dry Gear ---> Warm Moist Air = Condensation

The trick is to maintain the relative humidity from indoors until your gear comes up to the outdoor ambient temperature.

I've experianced a soft glow to pictures when taking my camera from AC to hot and humid, but the real condensation, which will blur out sections of the pictures has always happened when going from humid into the cold.

Keeping a lens cap on when first entering will help slightly, having it in a camera bag for the first few minutes between the transition will be a larger help.

I've always had the condensation clear up within the first three minutes though, even without taking any extra steps.

Get the camera and lens into the environment ahead of you as much as possible. Send an assistant ahead perhaps.