However, please note that "to be" is the only verb where you use the present simple to represent the future. With other verbs, we use the present continuous.
I'm going to class tomorrow = I will go to class tomorrow.
He is playing football next week = He will play football next week.
They are climbing Everest in 2012 = They will climb Everest in 2012.
There is a very good play on at the theatre tomorrow evening = There will be a very good play on at the theatre tomorrow evening.
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