If you're faced with filming an event, and are wondering whether you can, or even want, to do it yourself, here's some points to consider.
If you're going to do it yourself, you're going to need the equipment (own it, borrow it, or hire it), know what equipment you'll need, and know how to use it. On the day, you'll be busy recording it, instead of participating in it. And then you'll have the editing and dubbing work to do, afterwards.
If that sounds like more than what you want to deal with, you have a couple of alternatives: Get an amateur or a professional to do it for you, instead.
Getting an amateur to do it takes the workload off you, but will they have the equipment and experience to do the job that you require of them? Will you be happy with the results?
Hiring an experienced professional takes away all those concerns. We have high quality cameras, strong lenses that lets us film things across significant distances (whether that be filming from the back of a hall, or across a football field), and we have sturdy tripods letting us do prolonged filming with steady shots. We have microphones that we can place where they need to be (up close, even if the camera has to be far away), we have mixers that lets us use a combination of several microphones (as well as other sound sources), and lets us control the sound level appropriately. And if the situation needs it, and suits it, we can bring in lighting equipment. And we have the post-production equipment to do any editing that is required.
I should also mention that we can meet you part way, for those low budget jobs where you have the people you need to make a production, but not all the equipment, or you need video production crew to operate your equipment.