That is a really cool ambition. I wish you guys luck.
I am also planning to go to SteemFest, although I suspect I'll be going by bus or perhaps hitch-hiking, and I plan to stay in Amsterdam using CouchSurfing.
That way I can tell more people about Steem, and save money at the same time!
Btw, I see that your crowdfunding efforts have stalled a bit. So I suggest thinking of something cool that you plan to do at your trip to the SteemFest!
I am planning to write about it as I go, as well as take some interviews for @rusteemitblog, and some other project that is going to be announced in the future.
Anyhow, I wish you some inspiration and good luck! :-)
I wish you good luck, it will be interesting to see your trip diary)