A group of men are holding a meeting.
A group of men are enjoying a picnic.
A picnic is not generally described as a meeting.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_meeting(x3) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_enjoy(e1) & n_picnic(x3) & of(x1,x2) & n_man(x2) & n_group(x1))