Marrying in the hotter months? Avoid a melting 'mare with these ideas...
#1 First things first: if possible, avoid a cake with a lot of buttercream
If you're able to forward-plan, choose a cake with minimal scope for melting. Buttercream will melt in heat, meaning your cake will lose its shape very quickly - instead, talk to your cake-maker about a fondant creation instead. Fondant is lower in fat and stabilized by gelatine, meaning it's far harder to melt.
#2 Keep the cake cool on the move
If your baker is delivering your cake straight to your venue, they'll know how to keep it cool. If you're transporting it yourself, try the following: keep the car air-conditioned, keep it in the boot (wedged in place by boxes) and surround the box/storage with ice-packs.
#3 Once the cake is at the venue: don't do this
Avoid storing or displaying the cake in direct sunlight: all it will take is a couple of hours by a sunlit window for your cake to become a slippery mess. If you're planning an outdoors reveal of the cake, keep it cool in the venue's kitchen until the very last minute, when it can be brought outside.