I doubt if they will ever allow birthday or Christmas celebrations. The reason is that disallowing these keeps cult members from spending time with “worldly” people thus lowering the risk of members slowing in cult recruitment or exiting the religion completely.
Mascara and make up serves a useful purpose as well. It is used as a tool to criticize sisters who use too much, too little or a non approved color. This acts as a way to destabilize women in the congregation and doubt their own judgement in these matters, thus making them dependant on the leaders.