Affiliate link mistake or not I am glad you posted that link and I want you to know that I found it valuable and at least two of my ND friends did as well (including one that just recently started a business) and are now going to attend.
I know it was against the rules but I just wanted you to know that at least someone was glad you posted it and you made a positive impact in at least one person’s life.
Don’t get me wrong, I understand why the rule exists but I think I commented on the original post too and I didn't even take it as you trying to advertise, you even said it was an affiliate link. I thought it seemed like you were just excited, and the event is free after all (cost isn’t the point I know, I think that’s why I didn’t think it was advertising).