Option 1:
1. At the top of the channel, click on the down arrow next to "Meet"
2. Choose "Schedule a meeting"
3. A meeting invitation will pop-up, and you can schedule the meeting as usual (below). You can see what Channel is hosting/being invited (circled)
Option 2:
1. Go to the Calendar in Teams
2. Create a new meeting
3. In the "Add channel" field, choose the channel you want to include.