You started to get headache when you are invited to party. Not
because you are not please, but there often problem when you
have to choose the best gift for their occasion. Those who held
a party might celebrate their birthday, wedding, new birth,
passing an exam, etc. All have to be appreciated by giving them
gift.
Showing your appreciation to the person is the most important.
If you look into online dictionary, a gift is described as
something that is bestowed voluntarily [...]