I had always understood that using the simple present tense or the compound "going to do something" worked exactly the same in English as Spanish. Something planned or intended for the future. (Not the present continuous)
Visitamos a Lola este fin de semana.We are visiting Lola this weekend.Vamos a visitar a Lola este fin de semana.We are going to visit Lola thei weekend.
All the above sentences mean exactly the same thing.