Thanks Karl and Pat for those Doodle alternatives.
I'll explore those links. The big issue for us is the ability for local time zone support when scheduling meetings across multiple international zones. Most educators struggle with UTC conversions.
I've looked at Dudle previously (it's looking a bit dormant as a project these days, but might be worth a look). I've also identified this, given that we've already got a couple Drupal sites in the mix... https://www.drupal.org/project/makemeeting Given that Drupal is inherently timezone-aware, I'm hopeful that this functionality will be more or less equivalent to Doodle (and also easy to tie into our SSO system)... I'll do a test of it before the end of the week (I'm at a 3 day conference at the moment), and perhaps give you something try if it seems promising.