Okay - I had my very last meeting with Tiffany @ the Milleridge. I told her of our 'debates' on tipping and asked her if she knew what was customary.
Her first advice - check with the banquet office of the place you're at re: how gratuities are handled.
Some places may not share the gratuity/service charge w/the staff. At the Milleridge, the 17% it used to cover the entire wait staff...right down the bartender (no tip jars are on the bar although it is common for guests to leave a tip here an there - I do that when I go to weddings too). For the MD, it is customary to give $1-3 per person as a tip (depending upon the quality of their work). Bridal attendant - no standard - just what I feel comfortable with.