We had a reception in STK in July 2015, it was amazing! They gave us a private room for 10 guests and we selected a food and beverage package, which was easily amended to suit us. We had our own wait staff for food and drinks and they made sure drinks flowed all night. I think we were there for around 3 hours. We also went to the Chandelier, we had decided against pre paying and just hoped we would get a seat somewhere and we did, we also went around the hotel and took photos no problem, before getting a limo to the sign and then ghostbar. We didn't get married at cosmo but would highly recommend it for meal/party. I did get married 3 years ago so maybe you are looking for more up to date info, but I am back on the boards as I am planning to return to Vegas this summer, cant wait! Good luck with the planning!