What is the difference of the indication to venue and hall?

Why we differentiate venue and hall

It often happens that a venue has several halls for different events. Here we differentiate in which hall of this venue the event takes place. However, venue and hall may be the same in some circumstances. In this case, enter the full name of the location in the "Venue" field and the colloquial form in the "Hall" field (e.g. Venue: Max-Schmeling-Halle Berlin; Hall: Max-Schmeling-Halle).