Maybe. I don’t recall off-hand. I have a mind like a sieve, and at the moment my breviaries are thousands of miles away from me on another continent so I can’t check.(I think the same is probably true of Vespers on Holy Saturday and the Easter Vigil, but I do not recall a rubric specific to it?)
That’s it!Edited to add: According to the Universalis app (UK Divine Office), on Holy Saturday “as far as the Liturgy of the Hours is concerned, the Easter Vigil takes the place of the Office of Readings.” This appears in red. No mention of EP/Vespers.
No, on Holy Saturday one prays Vespers even if one is attending the Easter (Paschal) Vigil.(I think the same is probably true of Vespers on Holy Saturday and the Easter Vigil, but I do not recall a rubric specific to it?)