I have listed all files with possible invalid dates at
https://commons.wikimedia.org/wiki/User:Vriullop/WLM_2011_out_of_date
It is up to local organizers to check if they are valid for any reason that Guiness' agents can verify, otherwise the template WLM 2011 should be removed. Maybe some organizers are not currently reading this mailing list. Note that some users are still uploading images with WLM 2011 template. They should be advised that the 2011 edition is closed.
For Hungary I've been bold and I've created a new category:
* [[Category:Images from Wiki Loves Monuments 2011 in Hungary - international]] for the international contest with images with template {{Wiki Loves Monuments 2011|hu}}
* [[Category:Images from Wiki Loves Monuments 2011 in Hungary]] for the national contest with both the previous template and {{Wiki Loves Monuments 2011-hu}}
Only images in the first one are also categorized in the main [[Category:Images from Wiki Loves Monuments 2011]], so all files in this category should count for Guiness proof. I hope I have not broken anything.
Vicenç