Yes, you can collect on the Saturday after your usual Tuesday payment date. Check the opening times of your post office, some may only open for a half-day.
Information on Holidays and Social Welfare Payments.
www.gov.ie
In general you can take up to 2 weeks holidays each year and continue to have your social welfare payment paid.
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If you are getting Jobseeker's Allowance, Jobseeker's Benefit or Jobseeker's Benefit for the Self-Employed, you can be absent from the state for a maximum of two weeks in each calendar year, and get the two weeks payment when you return.