You simply park at the maymount nature center (huge parking lot) and walk over to the Italian gardens from there. The cocktail hour and reception will be hosted at the nature center. If you don’t want to walk over there is also street parking a bit closer to the Italian gardens.
We live about a mile from maymount so you can leave your car if you want and walk over to ours or bring your car if you feel up to driving. We have street parking in our neighborhood. You can leave your car overnight at maymount but it has to be moved by 10 AM. Uber is also a good option.