Yes, you can change + or - 10% subject to availability and rounded to the nearest 10. We ask you to confirm the final quantities, especially for weddings, one month beforehand, for reasons of availability and preparation of orders during the high season.
As a general rule, you should allow 50cm per guest at the table.
Depending on the size of your table and its dimensions, here is the number of people you can seat per table:
round table
150 > 8-9 people
170 > 9-10 people
185 > 10-12 people
Rectangular table
150 > 6 persons
220 > 8 persons