So basically we tip anyone who is a business and a gift to anyone that is not? I know for sure the caterer. For instance:
Caterer: Yes
DOC: No (works for herself)
DJ: No (works for himself)
Photographer: No (works for herself)
Videographer: Yes (business)
Cake: Yes (business)
Flowers: No (works for herself)
Limo: No (tip is included)
Officiant: No (Uncle of FI)
MU & hair: Yes (business)