It depends on the environment. I have worked with some large cameras which are mounted on fairly heavy tripods and I still have several cameras like that but most of the time its not really necessary to use anything that large. Modern technology is such that it is perfectly possible to use a small DSLR style camera to capture hours of 4K video on fast SD cards. So I much prefer the freedom that this gives to move into the optimum spot. I may still use a tripod for stabilisation of the shot, particularly during the speeches - sometimes a monopod is perfectly adequate.