On the site http://helios.guildlaunch.com I added a Calendar Widget and I turned "Sidebar List View" on.
But there is a sorting problem with the days.
During the month everything is okay, but at the end of the month the first days of the next month are shown first.
Thanks for letting me know. I'll ask the development team to have a look. The team will all be back in the office January 2nd, 2018. I'll follow up with you next week.