Just to update this event for those who haven't heard from other sources...
This event was held as scheduled. Fans had expected Alizée to attend most likely because of this Instagram post she made on February 10:
http://instagram.com/p/kPd7WkNoS7/#
Some French fans bought tickets and made arrangements to attend, and were disappointed when she did not appear.
The morning of the event, well mid-day in France, Alizée posted this on Instagram:
http://instagram.com/p/mM6f5RNoa-/#
She made a similar post on the first day of this year's Les Enfoires show, which a few members from this forum traveled to, only to find her not there though she had been expected to appear.
This has 'disappointed' many of the members of Alizée-France forum. It's generally agreed there that she should inform fans when she will not be somewhere that they expect her to be, to reduce travel, admission, and child-care expenses, as well as missed time at employment.