Filtering a Month based on a selection of a Week

Hi All,

I'm trying to create a formula where someone selects a week of the year in a slicer, and my formula takes all the dates from that week, pulls the MAX month from that week (since a week can exist in more than one month), and returns all of the "Volume" data for that entire month.

I have a formula like I explained above working when I use a slicer for a Date instead of a Week which I've included screenshots of below:

Notice, that I select the date 1/9/2018, and the "Volume MTD" field, gives me the values for the entire month of January.  If nothing is selected in the slicers, then I display the totals for 2 months before current month.  The formula I'm using for "Volume MTD" is the following:

Volume MTD = IF( ISFILTERED(Bookings[Bookings Date]),
                 CALCULATE(SUM(Bookings[Volume]), MONTH(Bookings[Bookings Date]) = MONTH(FILTERS(Bookings[Bookings Date])) ),
                 CALCULATE(SUM(Bookings[Volume]), MONTH(Bookings[Bookings Date]) = MONTH(TODAY())-2 )
)

 Using the same logic above, I want to filter for "Bookings Week" and have the entire month's total "Volume" show up in the same way that I have working by selecting a date.  When I try changing the formula above to the following:

Volume MTD 2 = IF( ISFILTERED(Bookings[Bookings Week]),
                 CALCULATE(SUM(Bookings[Volume]), MONTH(Bookings[Bookings Date]) = MONTH(MAX(FILTERS(Bookings[Bookings Date]))) ),
                 CALCULATE(SUM(Bookings[Volume]), MONTH(Bookings[Bookings Date]) = MONTH(TODAY())-2 ))

I get an error for the formula and I cannot filter a week to get the results of the entire month the week exists in:

Does anyone have an idea on how I can arrange my formula so I can use my week slicer for the results instead of a date slicer?

Thanks!