The rules of the board is that giveaways are forbidden, so how do I offer free altcoins to people 
There are plenty ways to announce for such project or campaign or announcements.You can anounce your free tokens giveaways/airdrops at Twitter/telegraph/Facebook/instagram and other social media sites.
Just try different approach you can use fill up forms for this via Google forms or by just sending you a direct message and personal message.