People are walking the marathon for a cause.
People are raising awareness of an issue.
People walking a marathon for a cause doesn't imply they are raising awareness of an issue.
exists e1 x1 x2 x3.(n_marathon(x2) & for(e1,x3) & n_cause(x3) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_raise(e1) & of(x2,x3) & n_issue(x3) & n_awareness(x2) & n_people(x1))