People under a tent at a reception.
People are at a wedding.
Being under a tent at a reception does not imply being at a wedding.
exists x1 x2 x3.(a_topic(x1) & under(x1,x2) & at(x2,x3) & n_reception(x3) & n_tent(x2) & n_people(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_wedding(x2)) & n_people(x1))