Okay kiddo, an install fest is an event where people get together to help each other install different computer programs or software. It's like a big party where everyone is bringing their computers and sharing knowledge and expertise to help each other get up and running with new software.
Think of it like building a Lego set - sometimes it's hard to figure out how all the little pieces fit together, but when you have someone who knows what they're doing help you, it becomes much easier. Similarly, an install fest helps people who might have trouble installing software by themselves get it up and running with the help of experts.
Overall, it's a fun and helpful way for people to connect and learn about technology together!