Don't accept an invitation unless repeated at least three times. People who have not been invited may turn up at dinner. They should be included graciously. Punctuality is appreciated but not demanded when attending social affairs. Getting drunk is considered greedy and rude.
Toasts are common in the Philippines, especially at business meetings.
Usually the host or lead of the visiting party initiates a toast. It is polite to decline the first offer of seating, food, drink, etc. Accept the second offer. Keep your hands above the table during dinner. Leave a small amount of food on your plate when you are finished eating.