The marketing team at ACME Ltd has 10 team members and has a public channel called #marketing-discussion. The team collaborates and shares ideas on this channel. Now, other teams have joined, so the total channel membership is 50.

The marketing director has the following needs:

There is an urgent marketing idea that must be prioritized in tomorrow morning’s planning meeting.

The 10 team members are the only ones attending the planning meeting.

The 10 team members need to be notified before the meeting.

Of note, the marketing director sends urgent re-prioritization messages weekly.

How should the marketing director reach the marketing team?