It's likely that many different organizations or individuals have used this phrase or a similar one to describe English conversation events or classes over the years.
To find out when a specific instance of "Eigo de Shabera Night" was created, you would need to know more context, like:
* Where did it take place? (City, country, specific school or club)
* Who organized it? (Name of the person or group)
* What year are you interested in? (e.g., was it a recurring event?)
With more information, you might be able to find specific details about the creation of a particular "Eigo de Shabera Night".