If you only have 1 DSLR camera for a public speaking job that lasts for 1 hour you need to hire something else.
Either;
at least 1 other 60D that you can set for a different shot, and then stagger the start so you can flit between both cameras to re-start and change cards. You will also need to purchase quite a few memory cards, or else you will have to transfer media onto a laptop whilst working and delete from the used cards meaning you have no backup. If you have to go down the DSLR route, I would recommend (at least)one other cameraman and camera for the job, and buy 4 more 32GB memory cards. You also need an external sound device for recording the speakers mic – you should be able to take a signal from the live mixing console and sync it in post.
Or, hire a camera that is more suitable for the job – something with a large hard drive, a tape or something that can output a signal via HD-SDI that you can capture into your edit suite. You should also be aware of the issue of overheating – Canon DSLR’s get hot when used for video; we used one for B-Roll on an event once, and it overheated after 1hr’s use and needed cooling before we could use it again.