For some participants the conference started on Sunday. That was my case. There were a couple of things that caught my attention:

• The registration desk was already open, so those arriving on Sunday can register and avoid any potential queue on Monday morning.
• There was an “Early registration Meet & Greet” to start getting in contact with other attendees.
• There was a “First time attendee orientation” session. It is the first time I see something like this, but given the conference is huge (over 2000 participant) it made sense to have some orientation.