Hi Ian,
Instead of sending over a list of users you emailed to say they had been accepted could you add a column to the workshop sheet of
FOSS4G Paper Selection Final version to indicate if a mail has been sent that way we've got everything in one place. If you're then happy that all accepted workshops have received confirmation could you then mail out to those that where not accepted the following:
"FOSS4G 2013 Workshop Selection
While your workshop did not get selected by the LOC, we're pleased to say that we have been able to arrange for some additional capacity and plan to run at least a day of workshops in parallel with the main conference. We would like to offer the community a chance to vote for the additional workshops, if you do not wish for your workshop to be included, please contact us before Monday 20th May."
Thanks,
Matt.