Hi my name is ***** ***** I can assist you. The best way to regain access to your Apple ID is to go to https://iforgot.apple.com/. Enter your Apple ID and it will send you a link to your e-mail address that will allow you to reset your password. You can then use your newly created password ***** your Apple ID to activate your iPad.
Let me know if this does not work for you and we can try other avenues to resolve your issue. If I was able to resolve your issue with this answer, please give a positive rating on the scale below.
Just checking in with you to see if you were able to gain access to your iPad.