Linuxwochen Wien, Vienna, Austria, 2019-05-02 - 2019-05-04 (no CfP yet)
2018
Tentative
2018-11-22 - 2018-11-25 Modell & Technik 2018, Stuttgart, Germany X2Go booth cancelled due to space constraints at the event
Linux Expo Ulm 2018, Ulm, Germany (unlikely to happen - but if it happens, probably before the official LPD 2018.2 date, which would be 2018-11-10)
2018-10-13, LinuxDay.AT 2018, Dornbirn, Austria - CfP for booth and talk or workshop sent (deadline 2018-09-01) - See https://linuxday.at
X2Go: The Gathering 2018 "Beyond the Release", Location: very likely "shackspace", Stuttgart, Germany (2018-11-09 to 2018-11-11)
The date has been decided upon
A poll/decision regarding the location will be held/made soon lack of sponsors and time/volunteer staff constraints mean that shackspace is most likely going to be the only viable option this year, so, no poll.