[TABLE="class: grid, width: 300"]
<tbody>[TR="bgcolor: #DCE6F1"]
[TD][/TD]
[TD="align: center"]
A[/TD]
[TD="align: center"]
B[/TD]
[TD="align: center"]
C[/TD]
[TD="align: center"]
D[/TD]
[TD="align: center"]
E[/TD]
[TD="align: center"]
F[/TD]
[TD="align: center"]
G[/TD]
[TD="align: center"]
H[/TD]
[TD="align: center"]
I[/TD]
[TD="align: center"]
J[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCE6F1"]1[/TD]
[TD][/TD]
[TD]2/1/17[/TD]
[TD]2/2/17[/TD]
[TD]2/3/17[/TD]
[TD]2/4/17[/TD]
[TD]2/5/17[/TD]
[TD]2/6/17[/TD]
[TD]2/7/17[/TD]
[TD]2/8/17[/TD]
[TD]2/9/17[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCE6F1"]2[/TD]
[TD]Instructor 1[/TD]
[TD]Cqt1[/TD]
[TD]Off[/TD]
[TD]Off[/TD]
[TD]Cqt2[/TD]
[TD]Cqt7[/TD]
[TD]Cqt2[/TD]
[TD]Cqt3[/TD]
[TD]Cqt5[/TD]
[TD]Cqt8[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCE6F1"]3[/TD]
[TD]Instructor 2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]
Cqt2[/TD]
[TD]
Cqt2[/TD]
[TD]
Cqt2[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCE6F1"]4[/TD]
[TD]Instructor 3[/TD]
[TD]Cqt3[/TD]
[TD]Cqt3[/TD]
[TD]Cqt2[/TD]
[TD]Off[/TD]
[TD]Cqt1[/TD]
[TD]Cqt2[/TD]
[TD]Cqt2[/TD]
[TD]Cqt21[/TD]
[TD]Off[/TD]
[/TR]
</tbody>[/TABLE]
I think this is what you want.
Select the H2:AC99, where AC99 is the end of the month and all the instructors in Conditional Formatting use this formula and select your formatting
Code:
=ISERROR(MATCH("Off",B2:H2,0))
If there is no Off in the prior 7 cells this will format the 7th cell. H3 is formatted because B3:H3 does not contain Off. I3 is formatted because C3:I3 does not contain Off and so on.