In order to make it as brief as possible:
– It must fit your budget.
– The location/venue fits your event, never organize an IoT conference in a medieval palace!
– The venue must contain the required facilities for your event. Put into consideration that you might need a WiFi connection, for example, if the connection was poor, it won’t turn out to be a decent choice.
– Attendees must be able to get there easily, make sure it’s quite close to parking and a bus station, for example, depending on the nature of your event.
– No doubt it must have enough capacity for the number of attendees of your event, buildings have a maximum capacity for safety reasons. Failing to meat that can lead to many consequences, not to mention putting people’s health at risk as well as legal consequences.