The present continuous for future arrangements is very common with verbs of travelling and when we are meeting people.
We can normally use the present continuous or be going to to talk about future plans.
But we prefer using the present continuous when we have made arrangements (i.e. decided on a place and time with somebody else). When use be going to, we put the emphasis on our intention to do something.
Use will for decisions that you take at the moment of speaking (instant decisions).
We use be going to or will (NOT the present continuous) to make predictions about the future. (⇒ See Grammar points » A2 Grammar » Will vs be going to – Future)
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