Possibly. If we had an event in Europe, it would probably be in London.
I would be really glad, because in europe (esp. in germany) at startup events we usually see some successful copycat entrepreneur as a speaker..
It seems like nearly no one in europe is taking risk in business to develop real innovation.
I understand that the language barrier can be stressful for Americans. London is therefore the default choice.
If you just want to do a headcount you can search Crunchbase by city.