I spent some time with preparing the OUCE 2015 and we use the free an open-source software frab as conference management system.
I do most of my server automation with Chef and my playground is running with Vagrant.
For this reason I decided to spend some time an built a Vagrant / Chef environment and contributed it back to the frab project.
This guys do a really good job and IMHO it is the best free conference management system you can get.
If you want to play with it feel free and give it a try and contribute.
We have finished our 6th OpenNMS User Conference Europe.
It was the first time we made a conference outside of Germany.
We started with the first conference in 2009 when I worked at NETHINKS and begun with OpenNMS professional services.
For the 3rd and 4th conference we decided to move the venue closer to the people organizing the conference and the IT center in Fulda was a really good place.
In 2013 NETHINKS and the OpenNMS Foundation Europe worked together to move the organization of the conference to the community at the University of Applied Science in Fulda.
cd ~/Pictures
wget http://files.opennms-edu.net/wallpaper/free-software-ulf.jpg
cd /usr/share/backgrounds
wget http://files.opennms-edu.net/warty-final-ubuntu-ouce.png
sudo -i
xhost +SI:localuser:lightdm
su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter draw-user-backgrounds 'false'gsettings set com.canonical.unity-greeter draw-grid 'false'gsettings set com.canonical.unity-greeter background '/usr/share/backgrounds/warty-final-ubuntu-ouce.png'