I am sure that I will accidentally leave some folks out (my apologies if I have), but here is a list of Day of DHers who I expect will be particularly engaging today.
Electronic Textual Cultures Lab http://dayofdh2015.uned.es/etcl/
The Ryerson Centre for Digital Humanities http://dayofdh2015.uned.es/ryersoncdh/
Initiative for Digital Humanities, Media, and Culture http://dayofdh2015.uned.es/idhmc/
DH Field School at BISC http://dayofdh2015.uned.es/dhbisc/