A new MongoDB meeting will be in Madrid on October 13th.
In this occasion I will have the opportunity to talk about Tag-based sharding. This will be complemented with a talk by Rafael Aranaz @rafaranaz about GridFS.
I believe the afternoon will be very interesting, users with less expertise and expert users will learn and have fun.
This is the link of the official MongoDB post: http://www.mongodb.info/2015/09/25/new-event-gridfs-y-tag-aware-sharding/#more-269368
Do not miss it!