The primary function of either is to emphasize the perfect indifference of the two (or more) things or courses ... ; but a secondary function is to emphasize the mutual exclusiveness, = either of the two, but not both.

12|07|2014 tba, Berlin
25|07|2014 tba, Wien
26|07|2014 tba, Berlin
22|08|2014 Love Techno Hate Germany // about:blank

Done:

WillaVuller Tier
ZGK @ Scharni Berlin
D.G.B Vienna
Scherer8 Berlin
Brainclub Braunschweig