Only edit selected Sheets in workbook

I'm designing a schedule and I need to set it up so that when I update the workbook only those sheets that need to be updated have the code run on them.
Each sheet in the workbook is a month, so if I'm making changes in August I don't need the last 7 months updated, just the remaining 4.

Right now my Macro updates all the sheets, unless I go in an remove their names from the array, which I don't want to do.

I know I could probably do this with a checkbox, but honestly I just can't seem to wrap my head around the userforms or active controls. I know enough to assign a macro to a button, which I've already done to run my code and update my sheets.

Can someone please help me with this and if possible explain how you did it.

Thank you.