visa letters for Debian attendance at FOSDEM 2016

[Daniel Pocock <daniel@pocock.pro>]

FOSDEM's FAQ says they only provide invitation letters for main track
speakers:

https://archive.fosdem.org/2013/faq/

and individual organizations like Debian are supposed to help in any
other cases.

I've had one inquiry from a previous GSoC student who would like to
attend FOSDEM but would require an invitation letter.  Has anybody dealt
with this situation before?  Can any local Debian or free software
organizations provide an invitation letter?

Regards,

Daniel