So this is what I got...

Here is what my Sharepoint list looks like

For the Gallery I mentioned earlier, I had to change the Items Property to include the Month #. Here is what i have now in Items property:
[
{Month:"January", Value:1},
{Month:"February", Value:2},
{Month:"March", Value:3},
{Month:"April", Value:4},
{Month:"May", Value:5},
{Month:"June", Value:6},
{Month:"July", Value:7},
{Month:"August", Value:8},
{Month:"September", Value:9},
{Month:"October", Value:10},
{Month:"November", Value:11},
{Month:"December", Value:12}
]
Here is the new list of controls on my Screen

In lblMonth i am using it to hold the month number. The Text property is set to:
ThisItem.Value
I set the Visible property to false because I am only using it as a placeholder
I added the GalleryUserDates as a second vertical gallery embedded in the parent gallery to list all the users and dates. The Items property for this one is set to
Filter(TestList,
StartDate>=Date(locYear,Value(lblMonth.Text),1)
&&
StartDate<Date(locYear,Value(lblMonth.Text)+1,1)
)
Then Title7 is just
ThisItem.Title & ", from " & ThisItem.StartDate & " to " & ThisItem.EndDate
Let me know if I forgot any other details...
Dave