People are sitting down in front of a white banner.
The people are having as sit in as a means of potesting
Just because the man are sitting down doesn't mean they are having a sit in.
exists e1 s1 s2 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_banner(x3) & a_white(s2) & Theme(s2,x3) & n_front(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_people(x1) & as(e1,e2) & a_in(s1) & Manner(e2,s1) & Actor(e2,x5) & v_sit(e2) & n_thing(x5) & as(e1,x3) & of(x3,x4) & n_potest(x4) & n_means(x3) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_thing(x2))