Lewis & Short

adventōrĭus, a, um, adj. [adventor],

  1. I. that pertains to an arrival or to a guest, cf. adventicius: hospitium, in which strangers were received, Inscr. ap. Mur. 470, 9.
  2. II. Subst.: adventōria, ae, f. (sc. cena), a banquet given on one’s arrival, Mart. 12 praef.