People are sitting down in front of a white banner.
People are sitting beside a banner, protesting something it would seem.
Just because the people are sitting down in front of a banner doesn't mean they are protesting something.
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 e3 e2 x1 x2 x3 x4.(for(e1,e3) & Theme(e3,x3) & Actor(e3,x1) & v_protest(e3) & Theme(e2,x4) & Actor(e2,x1) & v_seem(e2) & (x3 = x4) & n_thing(x1) & n_thing(x3) & beside(e1,x2) & n_banner(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))