Quack...
realised i din reply to the lower part of your msg. Anyway, you dun need the guest list lah.. but it's good to have a gauge roughly how many tables. For me, i ask for a rough estimate from my parents in law. Normally as days get nearer, list either increase alot coz u suddenly have to include more ppl, or decrease when u suddenly think you dun want to invite these ppl. So have to balance a bit lor. So do draft out a temp list... makes things alot easier for me! My frd had a outdoor one. But it's a ROM dinner thing so she dun have too many tables. I think approx 10 though she did a top up coz she din meet min table requirements or something. Not very sure. But the atmosphere is great. Since it's night time, not hot lah. Cooling in fact.