From 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]