A crowd of people are gathered at the start sign for the walk.
A group of people ready to start a walk a thon.
The fact that people are gathered in front of the sign does not mean that they are ready to start a walk a thon.
exists e1 x1 x2 x3 x4 x5.(n_walk(x5) & n_sign(x3) & of(x3,x4) & n_start(x4) & for(e1,x5) & at(e1,x3) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists p1 s1 x1 x2 x3.(a_topic(x1) & of(x1,x2) & Topic(s1,p1) & Actor(s1,x3) & a_ready(s1) & all x4.(n_thon(x4) -> exists e1 x5.(Theme(e1,x5) & Actor(e1,x3) & v_start(e1) & for(x5,x4) & n_walk(x5))) & (x2 = x3) & n_people(x2) & n_group(x1))