Counting two different columns on the same X-axis without prior aggregation

FrancaZ,

This solution requires a Weeks table consisting of each possible week. You can create this in Power Query or DAX. This table has no relationship with the data table. Here's a DAX calculated table (I renamed the resulting column to Week):

Weeks = 
DISTINCT (
    UNION ( DISTINCT ( Table1[Creation Week] ), DISTINCT ( Table1[Closure Week] ) )
)

Measures:

Count Creation = 
CALCULATE (
    COUNT ( Table1[ID] ),
    TREATAS ( VALUES ( Weeks[Week] ), Table1[Creation Week] )
)

Count Closure = 
CALCULATE (
    COUNT ( Table1[ID] ),
    TREATAS ( VALUES ( Weeks[Week] ), Table1[Closure Week] )
)

Use Weeks[Week] in a visual: