People gathered for a presentation.
Some people coming together.
Gathered is nothing but coming together.
exists e1 x1 x2.(for(e1,x2) & n_presentation(x2) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 s1 x1 x2.(a_topic(x1) & a_together(s1) & Manner(e1,s1) & Actor(e1,x2) & v_come(e1) & (x1 = x2) & n_people(x1))