Hi Everyone, I'm planning a small OS event in January in Hull, UK, and just wanted to refresh, to help me plan. So, for some context; I'm currently planning a half day event from around noon until 4pm ish, (4 hours) although this is flexible, depending on interest and numbers. E.g. it could expand to 12-5 or even 12-6. I may even consider a whole day. In a nutshell, I want to get an idea of some kind of 'formula' for OS, such as; given X amount of hours for an event, and X amount of attendees....etc. how many breakout sessions and how long for each session? And, how long would the opening and closing circles be..etc. etc., Are there any articles or resources that answer this idea of a 'formula' to help with planning? Or from your experience, what tends to work best? Many thanks! Isaac