It's pre-T2, so it should be very easy to install a Linux distro on it. The only bit of misery you're going to encounter, as others have said, is the Broadcom drivers. Except for a select few distros, you'll probably need a USB Ethernet adapter for installing the operating system and adding the drivers.
Also, I'd rather put my hand in the circle saw than try running a rolling release on this laptop because the driver uses DKMS, meaning that kernel updates sometimes break it.
I only know this because the desktop I'm typing this on has a Broadcom Wi-Fi card from when I used to bare metal Hackintosh this machine. I've since moved to a nice house with an Ethernet port in every room; also, I just use macOS in a VM these days anyways.
As others have said, OCLP is a thing and a well-oiled machine from what I hear, but also, the oath I have made to the Church of Linuxology demands that I at least recommend Linux.
I've never run an installfest, but I've been to my university's Linux Users Group installfests, and here's what they did:
Also, I'd recommend you bring extra USB peripherals in case the internal devices need a little bit of work; bring some extra mice, keyboards, and ethernet adapters. You hopefully won't need any of them, but they'll certainly make life easier if you do.
As for time, I'd imagine doing the basic install and ironing out some (not all) of the kinks probably takes less than it takes for a group to stat D & D characters, if that's a helpful comparison for you.