When you are planning an event photography session, you need to think about what types of equipment will be used or what you need to use when planning your own event. If you are planning events outside, you will need to get a weather resistant tent as to protect yourself or your equipment from the elements You need to make sure that you are perfectly equipped to deal with any situation in case a problem or an opportunity arises it's self.
If you are going to a large event, a full portable studio with backdrops and lighting rig, would be the best tool to bring because it opens you to take more professional looking photographs from the same location and can give the event a wider range of photographs that can be taken to impress the client. This can lead to more work and also will give the client reason to spread by word of mouth or online reviews about your excellent work.
When you are asked about your pricing packages, you need to consider how long you will be at the event for, what equipment you'll have to bring, and the cost of your time. Photography indoors like a corporate event would require different equipment than what you would bring to a wedding which would be considerably more expensive. With the different events, you would want to set up different packages for less or more time/photographs taken or the wider range of shots.
There might be additional options that the client might want for their event such as a Portable Studio which would give a larger range of photographs, while not having to move to a studio for the same photographs. Additional hours might be an idea to have so in case the client requires you to spend more time at the event but doesn't require you to spend a whole day when an additional hour is needed or to have another photographer to be at the event if the client thinks they are required.
Plan your costs around the time and equipment that will be used and having different packages to give the client more options if they want a choice to decide what suits them best. So you need to be prepared, have your time valued right, and give clients multiple options.