Are these sentences ok?
I'm just calling to remind you about the dinner tonight.
I'm just called to remind you about the dinner tonight.

Question

Answer

The sentence is fine.  If you are meeting with someone else, and it is not a group meeting, you could say "I'm calling to remind you about our dinner tonight".

Answer

I'm just calling to remind you of the dinner tonight.    or
I just called to remind you of the dinner tonight.

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