Every human have right to celebrate the festival of any religion. Holi is festival of colors, which gives message to remain friends with each person. No one should carry enemy in life. Diwali is festival of light with message of keeping life full of knowledge, love , friends. read more
I don’t know about other countries but in India, Yes they can. Holi is a festival of Colours and Diwali is a festival of lights. Many Muslim families in my neighbourhood celebrate Diwali and Holi. People of all religion celebrate Holi, Eid, Diwali etc together in India. That’s the beauty of unity in diversity. read more