Typically, they give presale access to repeat attendees ("Ions") before the general public gets access. As an Ion, there's incentive to go every year if only

Typically, they give presale access to repeat attendees ("Ions") before the general public gets access. As an Ion, there's incentive to go every year if only to maintain your ability to go next year (nevermind interacting with the Googlers who build the APIs you rely or the hardware seeding, clearly also benefits). Wonder if they've scrapped that this year too.