Ask. Just ask.
Here's a lesson in the power of asking.
Long shot, right?
I mean - come on. Seth is super-busy. Surely he gets a gazillion emails a day. And guaranteed: He has better things to do than to consider my completely unreasonable suggestion of having dinner together when he's next in the Bay area.
Seth replied within 10 minutes (no kidding) and we're having dinner when he's here next.
Just ask. Simply ask.
The worst thing which can happen is you get rejected. Big deal. Ask again.