Space-Time Manifolds

Suppose we have two events in Space-Time and they are (fictionally):

(1) In AD 0 Marcus Suetonius is walking his dog in Londinium

(2) In AD 2000 Ray Davis is having a coffee in a cafe near to the same place in London.

QI Can these two events be modeled as members of a set of Space-Time events in a 4D manifold?

Q2 If they can, are they joined** in this manifold by the entire set of events that can both have been caused by(1) and have been able to cause(2)?

Q3 If this manifold model can be built it it necessary to choose a frame of reference at the outset? Will Hastings 1066 be as good as any?

Q4 Is there a chain of Space-time events connecting (1) and (2) ? In fact are there many such chains of events connecting (1) and (2) ? An Infinite or perhaps rather a huge number ?

EDIT: Have I perhaps completely misunderstood what is an "event" in Space Time ?(For those who remember him Howard Roark/xyzt told me that in the past in his brusque way)

*joined" as in "join a group " -not "connected" or "joined up"

Edited October 17, 20169 yr by geordief