Whence they came none knew, but they went up the stony road and vanished into the hill, as if they went to keep a tryst.
None of the people of the valley dared to approach it, nor would they dwell near; for they said that it was a trysting-place of the Shadow-men, and there they would gather in times of fear, thronging round the Stone and whispering.
Swiftly then he told of the haunted road under the mountains, and the dark tryst at Erech, and the great ride thence, ninety leagues and three, to Pelargir on Anduin.
There are no more uses of "tryst" in the book.
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How did that other senator arrange and carry out trysts with a series of women while his wife was undergoing cancer treatment?