From AHD -
We are happy to announce that invites will soon open again. If you received temporary invites as a Christmas prize, you have until noon GMT on Monday, March 13th, 2017 to use them. After this date, any unused temporary invites will permanently expire. Users who normally receive invites as a user class perk will be able to continue inviting as normal past this date. As a reminder, AHD invites should only be given to users you personally know and trust. Any member found violating our invite rules or inviting bad users may have their account permanently disabled. So, invite wisely.
Official recruitment will also begin soon on select sites after temporary invites expire. Do keep in mind that recruitment takes place on class-restricted forums for a reason, so please respect our wishes and keep our recruitment information restricted to users who are actually able to see the appropriate forums.