People are gathered around for an occasion.
People are gathered for something.
When people gather for something, it is usually an occasion.
exists e1 s1 x1 x2.(for(e1,x2) & n_occasion(x2) & a_around(s1) & Manner(e1,s1) & Theme(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 x1 x2.(for(e1,x2) & n_thing(x2) & Theme(e1,x1) & v_gather(e1) & n_people(x1))