There are a number of ways to go about recording the conference while dealing with lighting and sound. Your camera isn't the best for low lighting and I'm sure that'll mean that it won't work well with the contrast of lighting on the presenters face and the bright powerpoint slides in the background. Your camera does have a mic input, but it's not a balanced XLR type so running a long mic cable to the presenters podium will likely give you hum. However, you can get rid of some hum in post.
As usual with advice about each event, "it depends." If you can get a copy of all the slideshows then you concentrate on capturing the speaker and add the slides in post. If you are situated near one of the audio speakers you need only run the microphone that far and you made not need an external mic at all depending where you set up your camera. If your auditorium has a sound board you may be able to plug into that but you will have to adapt your 3.5 plug to either 1/4" or XLR. If you can get your hands on an audio recorder to place on the speaker podium you can mix that in post.
If you can't do any of that, you need to be close enough to the presenter to get a clear image and pan over to the slides whenever the speaker looks that way. Just don't make any quick moves and try to linger on either the slides or the presenter rather than go back and forth like a ping pong match. You may be getting some whinning noises from having the camera plugged in rather than running on batteries, (one of my cameras does that) so bring extra batteries.
As with Rocket Science you have to evaluate the importance of your payload and put systems in place that match the project. Your equipment list says, to me, that this isn't really that important a project, so just try your best and have fun learning about all the problems that could have been cured with NASA's budget!
