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The wedding episode is indeed called Niagara. It was the fourth episode of the season. As it was an hour long you'll often see it listed as the fourth and fifth episode. There as not an episode with a wedding shower.
Nepolen
it is Season 6, Episode 4: Niagara
In this episode, The Office travels to Niagara Falls to celebrate Jim and Pam's wedding under strict orders not to mention Pam's pregnancy. Michael, Dwight, and Andy all want to hook up with guests at the wedding and Michael and Dwight meet twins.
Tan N
Episode 4/5.