Christians will often come together to pray. They will normally meet at their local church but it could take place anywhere. Jesus said that when Christians agree to pray together about something, God hears and answers.
Vigils are night prayers. Jesus would often pray at night. Christians like to pray at night because it is quiet and peaceful. Churches may organise a vigil if it is a special time in the Church year or if they are praying for something very important. Often if someone is harmed in their community there may be a vigil.
Christians believe that prayer is important. Write a letter to Alan the Alien explaining what prayer is and different ways in which Christians can pray. Alan really needs to know why Christians pray too!