Use memory cards that have huge capacities
Using a memory card with enormous capacity means that you don't have to worry about storage midway through an assignment. Having to change memory cards on the fly could cause you to miss opportunities for extraordinary images.
Backup your photos on the fly
Higher-end cameras can store images in two cards concurrently. Having a backup is essential as you don't want to lose your pictures should your memory card get corrupt for some reason.
Bring a laptop along with external storage
Shooting in raw takes up significant storage. It's great to clear out your memory card at the end of each day to ensure that the memory card is ready for use the following day. Having a laptop allows you to start working on some images on the fly. With social media being a thing, customers may require some photos right away to provide updates to their followers.
External storage to backup the images is vital as a safety measure. A standard external USB hard disk will work fine. You could also use a product like the HyperDrive ColorSpace UDMA if you do not plan to bring a laptop.
Have a spare camera with spare lenses
Just like memory cards, cameras and lenses can fail on you. To be safe, we usually bring two cameras with at least three lenses for any event-related assignments.
Use a camera with that is capable in low light with a decent external flash on standby
It is common to have to work in venues which are not well lighted. To ensure that you can operate at all times, it's always a good idea to use a camera that performs even when using high ISO settings. You can use the external flash to add a little more light in front of the subject in backlit situations.
The following are some images taken for CIO Academy Asia at ConnectGov Leaders Summit 2016 at Thimphu, Bhutan.