Hi, 1. We have gone to Ireland for our holidays last year. 2.
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"have gone" is present perfect, about your experience of life until the present, until now. So you could say "I have often gone to Ireland," or "We have gone to Ireland twice in the last six years."
But if you give a past time (last year, in 2015, yesterday) you cut it off from the present, and cannot use "have gone". It is past, so you must use past tense: "W