Three people standing and two sitting in a wheelchair.
The people are gathered
When three people are referenced in groups if numbers, it is implied they are gathered together.
exists e1 e2 x1 x2 x3.(in(e2,x3) & n_wheelchair(x3) & Actor(e2,x2) & v_sit(e2) & n_thing(x2) & card_eq_2(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1.(n_people(x1) & Theme(e1,x1) & v_gather(e1))