Where's My Maternity Leave?

Okay, last straw. I have been doing all of the work that falls under my job title PLUS that of the Education Director, along with all of the work that would be done by the phantom archivist, collections manager, registrar, exhibit developer, IT department, and on and on. But today the hammer came down.

My boss is about to embark on her maternity leave. There’s going to be no hiring or temp help during her leave. So during her leave I’m expected to take over her duties as well. In theory, should be easy since she doesn’t really do anything. But in reality, it means managing the upcoming annual fundraiser, even though I’ve never been here to even see it before. I’m supposed to coordinate all of the event’s components and make it happen. This is a huge event -- it raises all of our operating funds for the entire upcoming fiscal year. And I’m supposed to just pile that on. On top of managing the move of all collections. On top of running all tours and educational programs. On top of staffing the front desk myself. ARE YOU KIDDING ME?! There’s only two of us now -- myself and my coworker (who works as an administrative assistant), and we’re both working ridiculously long hours, sleepwalking through our jobs, and exploited by our employer with nowhere to turn. I hate that I’ve already decided to bail and look elsewhere for work, because it would further screw over my remaining coworker, but realistically, it’s going to take me awhile to find other work anyway, and I’m sticking to my decision to leave.