Come and go are both motion verbs; come refers to drawing near to a location, whereas go refers to moving away from a location.
Albert Einstein came to the United States via Switzerland.
We went to the conference in Norway.
Use come if the direction of motion is toward the present location of the speaker or the reader of the document.
Come here![towards the speaker]
I am terribly sorry, but I cannot come to your meeting
tomorrow. [towards the reader]
Use come if the direction of motion is toward the residence or workplace of the speaker or writer and the subject of the verb is not the speaker or writer.
Yesterday, a brilliant geophysicist came to our company for a visit.[Another person moves toward the workplace of the speaker.]
Otherwise, use go.
Go away![away from the speaker]
I am terribly sorry, but I cannot go to the construction site
with you tomorrow. [away from the present location of the reader]
Dr. Suzuki, who runs the Tokyo lab, will go to Italy
next week for vacation. [away from the residence or
present location of the speaker]