You have until January 15, 2019 to register any newly purchased Tamron lenses (teleconverters and Tap-In Console are excluded) to qualify for Tamron's VIP Club Membership for 2019. Benefits include:
Registration is not complete until proof of purchase is provided and you have received confirmation the registration process is complete. New members are admitted annually on Feb 15 and members meeting club level requirements will be notified via the email address on file.
See here for a complete list of membership benefits, details and rules.