It's not really an Airshow, more a Static Display.
In the last few years it was a good place to take photos because none of the displayed planes were parked behind fences or something like that.
Here are some of the participants that i know
Lynx MFG3
C-160D
Do 228-212 MFG3 (maybe the new painted one?)
UH-1D
S-76 (WIKING)
Saab2000 (OLT)
Do 228-101 (POLAR 2)
Turbo Basler (Polar 5)
AN-2
PC-9 (EIS)
Dove D-INKA (LTU)
Here link to the "official" site
http://www.flughafen-bremerhaven.de/" onclick="window.open(this.href);return false;