Angry Birds Transformers “Acid Storm” event is set to start on June 18 at 12 AM GMT and will end on June 25 at 12 AM GMT. During this 7-day event you’ll get a chance to unlock a brand new character, the second member of the Cybertronians squad.
The new character was announced in an update a couple of weeks ago:
What’s New in Version 1.16.0
**INCOMING TRANSMISSION FROM TELETRAAN 1**
/NEW CHARACTER! A Seeker makes his debut in June!
/NEW ACCESSORIES! Boost your Transformers characters by competing in new competitions!
/OPTIMISED EXPERIENCE! Many parts of the game have been improved!
If you encounter any issues in this event, be sure to report them in this topic.