This is a good question. I'm curious to hear what others say, especially with Scriptural references (if any). I feel weddings are a time to celebrate, e.g. wine is fine at a reception ...
John 2
Jesus Changes Water Into Wine
1 On the third day a wedding took place at Cana in Galilee. Jesus’ mother was there, 2 and Jesus and his disciples had also been invited to the wedding. 3 When the wine was gone, Jesus’ mother said to him, “They have no more wine.” ...
Later, in that same chapter, Jesus clears the temple courts of merchants who were turning God's house into a market (i.e., a form of disrespect). This being said, yes, there are ways to disrespect God's temple, but I have yet to attend a wedding where the bride and groom went too far. I'm not sure how I feel about the tennis shoes, costumes, etc.; maybe I'll marinate on that a bit more.
(About regular church services: This may be digressing, but I do find it disrespectful when coffee is served to church attendants in the lobby and allowed to be brought into the place of worship.)