Activity for Dawn

We are paying $4,500. plus meals for 5 band members and a DJ. for our wedding. How much of a tip should we give each person or is a tip necessary at all?

I live in the Deer Park area of Long Island, New York 11729. I purchased my bridal dress from David's Bridal and they assured me at the time that they could do the proper alterations needed on my gown. Well it turns out that they had no idea how to...