I don't get the market estimate where you include the guests. It seems like you're treating each wedding as an independent event. I'm attending two weddings in the next month. Are you counting instances as the same person at different weddings as the same person?
Otherwise, the presentation looks amazing and it's interesting to see a company be so open about their deck.
Counting each guest-visitation as a separate instance makes sense to me.
On one hand, the hosts will provide certain things for each guest. Invitations, individual decorations, etc. It's not like Rose & Billy can skimp on their flower budget because Marcie & John had nice bouquets at their wedding last month.
On the other hand, each guest will bring their own gift. In case of a themed wedding, they will probably buy something for that specific occasion.
Otherwise, the presentation looks amazing and it's interesting to see a company be so open about their deck.