OSCON will be in Amsterdam again after years of absence. How about a Python meetup in Amsterdam in the same week so that people attending OSCON can meet local Pythonistas and vice-versa?
I will speak about Python asyncio at OSCON and I could invite members of the audience to the Python meetup. Perhaps we can also convince other OSCON speakers or attendees to come to the meetup too.
My talk at the Portland PUG during OSCON 2015 was well attended and well received, and I wasn't the only OSCON participant to go to the meetup.