A group of people are running, and some of the runners are wearing the Native Americans headdress.
The runners are running in a charity race.
Just because people are running it does not mean they are runners in a charity race.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6.(n_headdress(x5) & (x5 = x6) & ne_nam_americans(x6) & a_native(s1) & Theme(s1,x5) & n_runner(x4) & Theme(e2,x5) & Actor(e2,x3) & v_wear(e2) & of(x3,x4) & n_thing(x3) & Actor(e1,x1) & v_run(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(n_runner(x1) & in(e1,x2) & n_race(x2) & of(x2,x3) & n_charity(x3) & Actor(e1,x1) & v_run(e1))