"However, I was reassured by both the mayor and staff that swearing me in just 1.5 weeks later would not impede council operations or decision making."
Lawson said her week's holiday was pre-planned for after the election, and before the swearing-in date was known.
The ceremony will be held at Waipatu Marae on Thursday morning, followed by a meeting at the Hastings District Council chambers. Returning councillors Damon Harvey, Bayden Barber, Malcolm Dixon, Tania Kerr, Simon Nixon, Henare O'Keefe, Ann Redstone, Geraldine Travers and Kevin Watkins will be sworn in.
They will be joined by newly-elected councillors Alwyn Corban, Peleti Oli and Sophie Siers.
Hastings Mayor-Elect Sandra Hazlehurst says she's disappointed they don't have everybody attending the inaugural council meeting.
However, she said Schollum and Lawson will be officially sworn in in less than two weeks' time.
"The date for the inaugural council meeting wasn't scheduled in prior to the election, so Wendy and Eileen were unaware of the date when they booked these holidays months ago.
"We'll be making sure elected members know these key dates in advance in the future."