FOSDEM (an european event) because its related to FOSS so you can meet people about many languages (devroom Java, Python, Rust etc ...), OSes like BSD, databases, embeded, radio and community initiatives (OpenStreetMap...) so it's very diversified.
Furthemore FOSDEM stand at Brussels in Winter a beautiful city with good food.
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FOSDEM (an european event) because its related to FOSS so you can meet people about many languages (devroom Java, Python, Rust etc ...), OSes like BSD, databases, embeded, radio and community initiatives (OpenStreetMap...) so it's very diversified.
Furthemore FOSDEM stand at Brussels in Winter a beautiful city with good food.