Atrium Hotel The Atrium Hotel in Orange County features two party floors, four ballrooms, over 10,000 square feet of dance floor, plus an incredible VIP lounge (Sunset Room) with a private bar. These incredible features make The Atrium is the best nightspot for huge parties like halloween and New Years Eve, to name a few! The Atrium Hotel will satisfy all of your meeting, conference and banquet needs. Our professional staff will cater and serve your night out in facilities for intimate meetings to grand receptions of up to 700 party-goers. Whether you need a meeting for 4 or a conference or a wedding party for 400, The Atrium Hotel is the ideal choice. Capable of providing a seductive and intimate VIP setting or playing host to one of the wildest NYE or halloween parties of the year, the Atrium is your hotel to dance and party then stay the night to recover!