So I am doing a 4 tier wedding cake for an outside wedding at the end of June. I am in the Shenandoah Valley in Virginia, so we can get some high humidity. I plan on refrigerating it here for travel but the venue said I can use their refrigerator if I need it when I get there. I am just afraid if I put it in the refrigerator there that when they take it out before the wedding it wont have time enough for the condensation to evaporate but on the other hand I don't want it sitting in the heat either. I should add, the venue has no a/c, it is an open outdoor kitchen with a walk in frig. Any advice? What would you do? Thanks in advance for your input and advice.

Take care of getting it to the venue in one piece.   Refrigerate before delivery.  What happens to it after it sits out in heat ........................???????  Brides know that heat and fancy desserts don't mix and they're taking a chance.  Are you covering it with fondant (I hope).  .You have two choices.  sweating and melting.  I'd choose sweating any day of the week.    You see more melted cakes on Cake Wrecks than shiny cakes.  The fridge is our friend.

Yes it will be fondant covered, using fondarific. I was planning on getting there about two hours ahead.

My fridge is my friend, but a commercial walk in fridge is the enemy. Those are very humid, just what that cake will not need. :(

AI was thinking maybe get it set and then just covering it with box. And since I am setting it somewhat cold the box may keep the cold in and the heat out. And having them remove box at last possible minute.

Probably not a bad idea. The cardboard will help soak up any condensation that will form.