Here is the SQL statement to correct your query.
In your primary table, you have the outlet linked to lookup table. You need to bring the lookup table into the query and use that as the source of the criteria for the name.
Code:
SELECT tblbookings.Date1, tblbookings.Product, tblbookings.Copies, tblbookings.Returns, tblbookings.Sales, tblbookings.Vendor_PX, tblbookings.Sales_Value, Format$(tblbookings.[Date1],'mmmm yyyy') AS Month1
FROM tbloutlets INNER JOIN tblbookings ON tbloutlets.OutletID = tblbookings.OutLet
WHERE (((Format$([tblbookings].[Date1],'mmmm yyyy'))=[Enter month in Format mmmm yyyy]) AND ((tbloutlets.Outlet) Like "*" & [Enter Outlet] & "*"));
Additionally, there is no need to have an aggregate on this query when all you are doing is looking up by outlet. There is no aggregation going on.