pray
The question already includes the answer: Muslims gather to worship (pray or during Hajj or pilgrimage).Muslims don't gather in worshipping places to plan for something or make rare actions, they just pray the way which is well known, they also greet each others after the end of prayers, then go home.
Five prayers.
Taraweeh are special prayers by Muslims in which long portions of the Quaan are recited during the month of Ramadan
jesus
Tarawih prayers are special prayers performed by Muslims during the Islamic month of Ramadan. They are optional prayers that are usually performed in congregation at night after the obligatory night prayer (Isha). The Tarawih prayers consist of a series of units of prayer known as rak'ahs, and are meant to seek spiritual rewards and blessings during the holy month of fasting.
It depends on who it is, most wouldn't mind because they both believe in god and stuff like that, but some Muslims might not want to, but i guess it is OK to.
a mosque
Muslims face Ka'aba in Mecca to preform Salat (prayers).
they will hope and hope and there prayers might come true just hope and hope
because they believe that Allah spoke Arabic. Muslims say their prayers in Arabic because Quran was sent in Arabic and began in the Arabic Gulf.
Ka'abah is the House of Almighty Allah (God). It was built by Hazrat Abraham as and Hazrat Ismail as. Muslims face Ka'abah while offering their prayers. They go round it during Hajj or Umrah.