Past events

COS 2026 - Thessaloniki

April 21, 22, 23 2026

Our biggest edition so far in terms of sponsors, speakers and delegates in the Hyatt Regency Hotel in Thessaloniki!

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COS 2025 - Nova Gorica

May 13, 14, 15 2025

COS 2025 - the Nova Gorica, Slovenia edition! The 14th edition will bring COS back to where it all started in 2011; the beautiful Perla Resort & Entertainment! May 13, 14 & 15, 2025; Spring in Slovenia!

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Modern multi-story glass building with illuminated signage at night, street with moving vehicles, trees, and a clear blue sky.

COS 2024 - Amsterdam

April 23, 24, 25 2024

Themed THINK DIFFERENT! In the Park Inn by Radisson Amsterdam City West, the 2024 edition was memorable! The largest setting to date, next door to Holland Casino Amsterdam West, and just before Kings Day.

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A canal lined with trees and parked cars in a city, with a boat in the water and a tall church tower in the background under a partly cloudy sky.

COS 2023 - Bucharest

April 25, 26 and 27, 2023

Compared to COS 2022 - the Riga edition; Larger number of delegates, more sponsors and a broader line-up of speakers. The event is still growing.

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A colorful fountain at sunset with illuminated water jets in pink, blue, and purple, and a three-tiered ornate fountain in the center.