We sailed the Liberty of the Seas for the Western Caribbean departing 6/16/07. It was our second cruise, our first on Royal Caribbean.
Sunday was the first formal night and everyone participated enthusiastically. There was a champagne reception on the Promenade which was lovely and provided an excuse for all to promenade in their finery. Most all the ladies were in nice dresses and gowns. Lots of tuxes. The second formal night, on Wednesday, was largely unobserved. There were a very few tuxes. But most everyone treated this night as any other night in the dining room.
Photographers were everywhere with painted backgrounds or with attractive ship features providing a backdrop. But the location of setup/posing for shots and the lines to be photographed created unreasonable congestion. It's a well designed ship; easy to get around. But sometimes you had to get creative to find a path that didn't provoke "Excuse me, we're taking photos here!" (say with affronted entitlement to personal ship space).