Visiting Hamburg - meeting nice InterNationers?

Hi Hamburgers ;-)

I am planning to come to Hamburg from 9.-11th of April and am looking for ideas how to spend the weekend there alone. Are there any happenings within IN-community that weekend? Or would somebody be interested in showing me some nice spots in town or meet for coffee/drinks? Or somebody want to go see a musical (König der Löwen or Tarzan) on the Friday or Saturday?
Haven't booked anything (train/flight, hotel, ticket for musical) yet, so if anybody has interest for the above, let me know.

Also: does somebody know a nice and central hotel to stay, not too expensive?

Cheers,
Leena