It needs to fit on a single A5 landscape page, so Saturday on left half and Sunday on right half. The badge will then be folded down to A7 landscape to go in the pouch with the schedule on the inside.
The talk entries should show the talk Title (some might need truncated/adjusted to fit) and Speaker name, using the same colour scheme as the online version though probably paler to be easily readable
We need it in a document format that is still editable, so we are able to easily make any last minute changes and be able to export to PDF, apart from that you can choose your tool of choice whether that is libreoffice, inkscape, scribus, LaTex etc :-)
This isn't that technically complicated just will take a bit of time fiddling with sizes