Whether on a specific date of the year, or at any other general day, turning Masaajid into museums in the name of ‘Mosque or Masjid Open Days’ remain Haraam!
In the past, several articles have been written in this regard. Hereunder are the links to view the articles:
http://custodiansofthehaq.co.za/analysing-mosque-open-days/
http://custodiansofthehaq.co.za/a-new-norm-mosque-open-museum-days/
http://custodiansofthehaq.co.za/mosque-open-days/
http://custodiansofthehaq.co.za/mosque-open-days-remain-haraam/
http://custodiansofthehaq.co.za/mosque-open-days-a-response/