一いっ席せき設もうける

expression, ichidan verb

hold a small dinner party; host an informal gathering

Used for arranging a modest, often intimate meal or social occasion, typically at a restaurant or private setting. Implies a degree of formality in the invitation but not a large-scale event.

• 久ひさしぶりに旧きゅう友ゆうを招まねいて一いっ席せき設もうけた。

  I held a small dinner party for some old friends for the first time in a while.

• 来らい週しゅう、取とり引ひき先さきのために一いっ席せき設もうける予よ定ていです。

  We plan to host a small dinner for our business partners next week.