Demo and coding parties are great events where people with demo scene related skills (from coding, pixeling, composing to simply drinking beer) meet to watch and celebrate their new creations. If have one of these skills but have never been to a demo party, I really recommend you change that. Typically demo parties are held with a yearly schedule at the same location. 

Party Month Location Releases Visited
Evoke August Germany - Cologne Link 2010
Forever March / April Slovakia - Horná Súča Link not yet
Fujiama August Germany - Lengenfeld Link 2011, 2012, 2013, 2017
Revision Eastern Germany - Saarbrücken Link 2011, 2012, 2013, 2014, 2015, 2016, 2017
Silly Venture November / December Poland - Gdansk Link 2013 (pictures), 2014 (pictures), 2016 (pictures), 2017
tUM - The Ultimate Meeting December Germany - Darmstadt Link 2010, 2013