The content should already be complete and formatted by speakers, according to the instructions and Style Guide. We don't look to do a thorough review or make any substantial changes to content (maybe spell check and look to fix obvious formatting problems). Also, submissions are allowed to trickle in until the time of Summit (past the stated deadline), so the work on the proceedings document can be completed shortly after Summit.
The 2016 Proceedings Paper was compiled and built using Adobe InDesign (we have source files available), but this is not a requirement for 2017. STC does not offer or supply any software. Expectation is that a comparable proceedings document can be collated using Microsoft Word and published as a PDF.
Here is a link to a description of the Summit Proceedings Designer role. (Thank you for putting the description together, Michael Opsteegh!)
From the description:
If you're interested, please email stcsummit at gmail.com.