Offer to chair a session - how should I decide whether to accept? I am doing my PhD and presenting a paper at a conference, which I have already done a few times. However, I just saw an email from the organising committee asking if I am willing to chair one or more sessions. How should I decide whether to accept this offer? What are the reasons to accept, and what are the reasons to decline?  Is it a very common thing to do for a graduate student, who does not even have a Ph.D, to be invited to chair a session? While I feel honoured, I am also somewhat overwhelmed and not sure if I should accept it.
Yes, you should.

Whether this is common depends very much on the conference.  The last time I was at a conference, I was invited out of the blue by someone I didn't know to chair a session, in a very short and very informal e-mail as if it was coming from a long time friend in a hurry.  This was less than a year after I obtained my PhD.  A PhD student in our research group did the same.

All it means, really, is that you sit on a chair in front of the room, make sure the presentations are on the presentation computer, announce the speakers, etc.  You will get detailed instructions.  Unless you mess up (and why would you?), you really have nothing to lose.