Point 1 - First of all , it is a mistake of the lady to go to a music concert as most of the Islamic Scholars have agreed that music is Haram. If you are representing Islam being a Muslim (practicing muslim) you must know that listening to the noise created by musical instruments is Haram. Listening to Muslim is undebatable where the extend of covering your head (like the whole face should be covered or only the ears , neck, hairs to covered, scholars have different opinions).

Point 2 : If they have accepted bikinis, upskirts, torn jeans in the context of "Giving Women Freedom to wear whatever she likes" , why not they accept these women wearing a veil as this is their own choice.

Security Reason - I won't agree as we live in the 21st century with all the sophisticated technology to deduct any security threats.

Social communication - Most of them say " We don't accept faceless people in our society". That is just so childish, if you don't like, leave them alone, don't socialise with them. Same like most of us don't like dress code which reveals cleavages, upskirts bikinis in public. Respecting the thoughts of these people why not they altogether ban bikinis and revealing dress code and bring a modest dress code for all..

Point No 3 - This is my opinion.