As I hail from india,I can't say any one favourite festival because we have many festivals celebrated here in India and I enjoy all of them.
We have diwali festival which is also called the festival of lights,we have durga puja in which we worship goddess Durga and her various avatars for 10 days ,we have holi which is a festival of colours,chath puja which is a festival in which we worship sun , ramnavmi festival ,kali puja,ganesh puja, saraswati puja and many more.
In all our festivals we worship one or other god and eat delicious food and share gifts with family and friends,we also offer food and gifts to the poor.