The Dutch have big birthdays because they know it's your birthday, and they force you to celebrate it by setting up a celebration for them. Your Dutch friends and colleagues will not forget that your birthday is yours, they will remember it with their birthday calendars, just like we do.
In general, the Dutch are very satisfied with the gifts. Don't be surprised if the Dutch express their honest opinion about the gift.
The guests of a typical Dutch birthday party are a mixture of friends, family and other acquaintances. It is customary for at least three or four generations of the family to be present, with a maximum limit determined by the average human lifespan.