Howard and Bernadette's Wedding

The wedding of Howard Wolowitz and Bernadette Rostenkowski took place in the Season 5 finale "The Countdown Reflection" on the rooftop of Leonard, Sheldon and Penny's apartment building.

Engagement
Howard and Bernadette were engaged in "The Herb Garden Germination" (S4E20).

Preparations
Everyone was not able to have a idea where to have the ceremony. But Leonard, Sheldon, Penny, Raj and Amy were all ordained as ministers and able to perform the ceremony.

Ceremony
The ceremony eventually took place on the roof of Leonard, Sheldon and Penny's building. The only attendees were Howard's mother Debbie Wolowitz and Bernadette's father Mike Rostenkowski. Each of Howard and Bernadette's friends each gave them their own vows. There was one last bit of friction between Leonard and Penny about Leonard's proposal to Penny during sex which Amy eventually put an end to after Penny started reading out her vows. Sheldon attempted to do his vows in Klingon but Bernadette stopped him since she disallowed him to do that.

At the end, Howard and Bernadette had their first kiss as a married couple and then the camera cut to over their heads, then backed out further showing their friends, Mrs. Wolowitz and Mike clapping and then of the building then all the way to space with a full view of the Earth. Mrs.cWolowitz was also seen for the first time during the backing out.