Acropolis tickets on first Sunday

[mom4mom]

I understand that it is free to get into the Acropolis on the first Sunday of every month.  We will be there this Sunday, 11/5.  How can we attain tickets?  I don't see anywhere to get them on their website.  Do we just show up?

[mjox32]

I just tried to purchase tickets for Dec.3, which is a Sunday and I got this message - 

The selected date is an Open Day with free access to archaeological sites, monuments and museums. Free admission tickets for this date are exclusively issued at the ticket office of the site you are visiting.

Online Tickets for Archaeological Sites 

[mom4mom]

Thanks.  I was never given that message to get tickets at the ticket office on that day.  Hopefully there will be no problem.  I'll try to come back here to post my experience so you will know for Dec.