The band generally introduces the wedding party as couples enter the room while playing upbeat energetic music in the background with no lead vocals (so that guests can hear the introductions).   Most often parents are included in the bridal party and are introduced first.  Grandparents are often acknowledged directly from their seats instead of walking in with the bridal party.  The bandleader will get everyone in order and lined up before the announcements, and go over name pronunciations, leading up to the grand entrance.