BE GOING: planes o intenciones (Voy a bailar con mis amigos)
PRESENT CONTINUOUS: acción futura con día y fecha (Estoy bailando con mis amigos el lunes a las 20:00)
On Monday I am going to London with my friends. We are going by car. My friends and I are staying at a great hotel there in London where we are going to relax and have fun. There is a spa and gym at the place we are staying at. When we arrive, we are going to visit one of London's big museums of art and have lunch at the restaurant. At midnight, we are going to return home.