Hey folks!
Even though a bit late, I would want to thank you very much for organising the conference!
Was a pleasure coming along, everyone was so friendly and I met a lot of great people.
Will come next year as well 
A thing to improve, I see is the attendance rate. It would have been great if more (local) people attended, especially students.
I talked to Elio about this and it was clear that your goal is to foster the open-source ecosystem with your conference.
What a better way to bring new people in, than to trigger students that seek meaning, purpose and job opportunities.
You had many projects and companies attending, a great way to get more people involved in FOSS development
We discussed that a way you can get more students joining the conference and get in contact with open-source projects/companies, is to go into schools and universities and giving short presentations about the conference.
Regarding the messaging of these presentations:
Elio told me it’s important to you to emphasise the conference to be around open-source. But I don’t think it would be most effective to make your presentation around this message, because it may not be the most important argument why students would join.
IMHO a more powerful message would be job opportunities and the contact with established companies, developers, scientists.
Of course you should not leave out the open-source part, as it is integral to your conference.
Hope my input helped and looking forward to next year