Conversation so far:
what is the importance of ramadan in Islam
Ramadan is the most sacred month of the year in Islamic culture.
when was Ramadan established
Ramadan was established in the 7th century when the Quran was revealed to the Prophet Muhammad. His revelation began in 610 CE in Mecca at Hira Cave on Mount Nur.

Question: when is the celebration scheduled for in 2020
Self-contained rewrite: when is Ramadan scheduled for in 2020