I am going to present my research on a conference in the near future. This conference is in the field of engineering and CS. It has several sessions in parallel and a total of more than 100 papers.
When I had a look at the program, I noticed that I (and another person) have been assigned the role of the session chair of the session where I am also presenting. However, nobody has informed me of this, yet, neither have I been asked if a want to take this over. I had a look at the other sessions, it's similar there: Two presenters in each session have been selected to be session chairs.
So far, I have never experienced something like that. All in all I am not complaining at all (to be honest, I am looking forward to taking over this task!), however, I am still a bit surprised. Is it common in other fields or other conferences that presenters are managing their own sessions and are not asked whether they are willing to do so?
UPDATE: I was at the conference and some other chairs and attendees told me that this is indeed common there: They just assign the session chair role to people and sometimes miss to tell them beforehand. Nevertheless, everything went well and as expected this was an interesting experience.