The official language of Malaysia is Malay or Bahasa Melayu.
As Malaysia was a former British colony, English is widely spoken although less so in remote areas.
Malaysia is a predominantly Muslim country but Hinduism, Christianity, and Buddhism are also practiced here.
Eid-al-fitr is celebrated to mark the end of Ramadan, although the dates change every year (currently it falls around July), and much of Malaysia, especially predominantly Muslim areas shut down as everyone goes home for the holidays which usually last several days.
Chinese New Year is celebrated usually in February by the large Chinese population in Malaysia and you can expect lion dancing in the streets as well as lanterns and fire crackers.
Deepavali is the festival of light celebrated by Indians in Malaysia. Colorful lights and oil lamps are hung and there are fireworks and street processions. It usually falls in October.