<human>: Can you succinctly summarize the text in 1-3 sentences?

If I volunteer for a specific task during a specific time-frame then I really don't fucking appreciate being emailed at the last minute being told "oh by the way, we signed you up for this other thing too".  Granted I could just say no, but the event is a few days away and their lack of advanced communication means that a key role would be left unfulfilled. So sure, I'll do it this time because I care about the outcome, but I will not volunteer for this organization again.  Had they asked me in advance if I was willing to take on this other task I would have declined, because (A) I have done this task in the past and it is probably one of my least favorite parts of working an event, and (B) I have to be somewhere afterwards so if things run over on time, which they often do, they are going to have to scramble to get someone else.
<bot>: Don't randomly sign volunteers up for things at the last minute without asking them first, you're really just screwing your organization over by alienating a supporter.