A group of people are at an outside function of some type.
Some people are celebrating a holiday outside.
Just because a group of people are outside does not mean they are celebrating a holiday.
exists p1 x1 x2.(exists s1 x3 x4.(at(x1,x3) & of(x3,x4) & n_type(x4) & n_function(x3) & a_outside(s1) & Theme(s1,x3)) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_celebrate(e1) & n_outside(x2) & of(x2,x3) & n_holiday(x3) & n_people(x1))