The Collaborative International Dictionary of English v.0.48:

Trysting \Tryst"ing\, n.
   An appointment; a tryst.
   [1913 Webster]

   Trysting day, an arranged day of meeting or assembling, as
      of soldiers, friends, and the like.
      [1913 Webster]

            And named a trysting day,
            And bade his messengers ride forth
            East and west and south and north,
            To summon his array.                  --Macaulay.
      [1913 Webster]

   Trysting place, a place designated for the assembling of
      soldiers, the meeting of parties for an interview, or the
      like; a rendezvous. --Byron.
      [1913 Webster]