I'm not sure about flowers, but little touches do go a long way.
I provide equipment for my tourneys, and I decided some time ago to buy a wooden set to use at the top board, while everyone else plays on the standard roll up vinyl. I've been surprised how many people have commented on how cool that was.
It really is surprising how far something small like that can make a difference.
Candles and flowers? Maybe not so much. Wrong theme, and practical issues, but decor in general definitely makes a difference.
Now that I think about it.....tablecloths. I can make some really cheap. I think that might seriously be on the agenda for the next event.
(I'm also not sure if you are serious.)
Perhaps if there was more pagentry involved in the sport more of the world would take notice and get involved, and imagine how much more pleasant candles and flowers at the chess tables would make the sport. Little touches like that are often overlooked, but add so much to the ambience and nature of the experience.