Integra will greet anyone who enters graciously, and thank them for coming. There'll be tea (imported from England), finger sandwiches and whatever else sort of refreshments others brought. While the main house, and library, is open, private rooms like her bedroom, office, and access to the lower levels and sub basement (although the latter's entrance is hidden) has been locked off. She will also caution that while she's not going to stop anyone from trying to greet her Noivern, Carmilla doesn't like being approached. Unless you've got pineapple.
There will be croquet and badminton for whoever wants to play it and while the piano will be open classical music will be played from the stereo. There's also liquor for people who don't want just tea and colder drinks as well.