Hi cheer and miow miow, thank you for the helpful advice. If the hotel could help to give 31+3R will be best but I doubt the hotel will. Anyway I will try to ask - no harm trying.
cheer > yes, I also thinking how to shift the people since nobody will like to be separate or shift out of their group. And if there are only 2-3 seats empty, I think we can only leave it as it is. If there is a big empty seats like half of the table then will have to consider for shifting. Right now my est. no. of tables are 35 but out of this 35 tables there are 2 tables of ppl not confirm yet (meaning they have not reply if they will be able to come) that's why I'm in a headache if I should consider as 32+2 or 33+2 (if confirm 2 tables not coming, then i will have 33 tables confirmed and the 33 tables of guest must really come and not put aeroplane, otherwise predict will lose out 1-2 tables.