invitational

/IH0 N V AH0 T EY1 SH AH0 N AH0 L/
noun
  1. 1

    An event, especially a tournament, that is restricted to invited participants

adjective
  1. 1

    Serving as an invitation; inviting.

  2. 2

    Restricted to participants who have been invited.

Source: https://en.wiktionary.org/wiki/invitational