The live streaming equipment a school needs to ensure they can support a simple event mixing between 2 cameras and laptop for slideshow/video includes:
Blackmagic ATEM mini
2 laptops (1 for powerpoint/video and 1 for streaming with OBS installed)
2-3 video devices (tablets/smartphones)
2-3 Tablet/smartphone tripods
monitor/TV screen
4 HDMI cables
2 lightning to HMDI converters or USB C to HDMI
XLR cable
XLR to minijack converter
headphones
power board and extension cords
Watch the video (left) to get a general idea of live streaming.