Your Sims will automatically wear formal wear at wedding and pre wedding partys. For family gathering, there's also an alternate version available where they'll choose party wear. Bach parties remain untouched as they are already set to the appropriate party wear.
A small add-on set of ivy to match the ivy in the Vampires pack. I like to stack and layer all the pieces together to make it look like it's climbing up the side of a wall. It helps to enable the moveobjects on cheat when you use these!