You may be talking about the first two episodes, when they are preparing for the wedding ~ at that time, Monica's parents spent the money for her wedding, and Chandler's savings were just enough for Monica's grand wedding plan ... I think this is it. ...
In addition, Monica said that girls have dreamed of their own weddings since childhood. At the end of the fourth season, when Ross and Emily got married, the venue was demolished. Ross insisted on finding a place to tie the knot. Monica told him that.