Dear Art Librarians,

Thank you for all of the thoughtful and thorough responses!  My colleague appreciated the many helpful resources, as did I.  I have compiled the resources below:

Several librarians directed me to the Art Newspaper <http://theartnewspaper.com/shows/?SHOWALL=1> and Artnet <http://www.artnet.com/events/museums/>.  These are excellent websites for a broad audience!  E-flux is another great, easy to use resource with an international scope <http://www.e-flux.com/announcements/>.  

Among print publications, the Burlington <http://www.burlington.org.uk/whats-on> and Frieze <https://frieze.com/on-view> had the best online exhibition calendars.  The Artforum Art Guide <https://www.artforum.com/guide/> is available as an app!

For exhibition news via email subscription, librarians recommended Art Daily <http://artdaily.com/index.asp>, Hyperallergic <http://hyperallergic.com/newsletter/> and art magazines such as Frieze that offer weekly recommended exhibitions via email.

For art librarians, the e-bibliography on Art History Resources <http://arthistoryresources.net/ARTHnews-blogs.html> and the announcements on Art & Education <http://www.artandeducation.net/announcements/> are great for a variety of searches including, and beyond, exhibitions.

And finally, for my colleague, whose question was about Vermeer in particular, an active list of every Vermeer exhibition,1838-2018 <http://www.essentialvermeer.com/references/vermeer_exhibitions.html>.

Again, many thanks to everyone who replied!

Best Regards,

--Kim