When do you go to Mecca?

Answer 1

All Moslems are required to go to Mecca and do the pilgrimage known as the Haj at least once in their life. It usually takes place each year around January.
Going to Mecca is a must for the fifth pillar of Islam which is the pilgrimage.

Answer 2

In Mecca there is the Holiest Islamic Building (Kaba) surrounded by the holiest mosque (Al-Masjid Al-Haram or the Grand mosque). In Mecca, Muslims do some Hajj (pilgrimage) pillars without which Hajj will not be licit and completed. Praying in Al-Masjid Al-Haram is more rewarding than anywhere else on earth.

Answer 3

It starts on the 8th day of Dhul-hijja (Islamic month). It continues till the 12th day.