As it stands, it is a regular meeting. However, there are provisions. There was a routine motion adopted by the committee to allow it to take evidence with a reduced quorum. A reduced quorum is three, provided that there is one member of the opposition and one member of the government present. If the committee agrees that it's just to take evidence from the witness, then those reduced quorum provisions would apply and no decisions could be taken unless there were quorum, but it would still be an official meeting.
On May 22nd, 2018. See this statement in context.