Not only would Duke Mason's party contain expensive alcoholic drinks, but it would offer numerous exquisite dishes as well, having even retired chefs from the royal palace to cook the food.
The reason that Lady Melissa had known about this was because she could vividly remember news and gossip articles both alike talking about Duke Mason's exclusive party for the first few days, and how there was such a commotion regarding the topic.
The party that was talked about in the news and gossip articles was regarding Duke Mason's first party, due to its exclusivity news reporters wanted in- and so were the others, they wanted to know more.
Practically everyone in Duke Mason's party was either, a. Someone that Duke Mason was planning to use to his advantage for and to make a mutual agreement on or b. Someone powerful and strong that was one of Duke Mason's many allies.