i've attended 2 events at Oasis. one at the pavilion where its open air, and the other inside one of the function rooms. the pavilion is big but it can get hot during summer days although they do have big fans provided. the function room (not sure the name) is the one at the ground floor. its not that big and one thing i didn't like about it is that there are columns within the room so sometimes the view of the guests are blocked.