How to count the number of tables and seats to celebrate the 65th birthday?

Wedding on Rest Day: Estimated number = number of relatives and their families+number of other guests such as friends +0.5.

Weekday wedding: estimated number = number of relatives and family members x0.8+ number of other guests such as friends x 1.2.

Calculate the number of tables with the expected number of people: expected number of tables = expected number of guests/10+ expected number of guests/100 (table preparation).

No one can predict the details of the wedding day, so prepare a backup plan:

Ask the hotel in advance about the charge for preparing a table, such as is there a charge for not opening a table? Can I temporarily add seats? How much is the charge? Can we temporarily add extra tables? How much is the charge? Are there any other private rooms that day? In case of bad weather, can I return a table without a seat? If so, try to keep the guests seated. If not, it is more comfortable to sit or spread out as planned.