What is a sherpa? does anybody know

a member of a Himalayan people living on the borders of Nepal and Tibet, renowned for their skill in mountaineering.

INFORMAL

a civil servant or diplomat who undertakes preparatory work prior to a summit conference.

Explanation:

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.

i think that will have something to do with the mississippi river but google will know the full answer for sure