Having workshop make me tired, but I get many things: more knowledge, more friends, more experience, and more, more...
It won't lose my students right in their study (when we're having workshop),since it is conducted on vacation or holiday.
I'm as teacher feel uncomfortable if I have workshop, or leave my students in effective time for PBM,so if it happens I give assignment to my students from far distance and they should send me their assignment via my e-mail and I can correct it or give comment directly.
That is my way to lessen my guilty.