Keeping contact with PI whose lab I will be joining?

[misslitty]

I've accepted a PhD position to join a specific group's laboratory.  We have already gone over the details of the position, and they sent a group email to his lab members welcoming me.  I don't start until Fall, and am wondering how I should keep the communication lines open with this PI without annoying him.

[MarineBluePsy]

If you've completed the paperwork regarding your acceptance there is nothing wrong with you reaching out to the PI and asking if there's anything he'd like you to do between now and the fall.  Perhaps there's some suggested reading or some online training that needs to be completed.  You can also ask what frequency he prefers for communication between now and then.