Semi Formal/Dressy casual/Cocktail/Festive attire is great think garden summer party This is outdoors with a tent a jacket may be necessary in the evening Tents will be set up on a lawn so be mindful of appropriate footwear (maybe not spikey heels lol)
There will be an open bar while supplies last as well as wine and canned beverages. There will be non-alcoholic beverages as well. Feel free to bring anything else specific if you like