Install a NeoForge 26.1.2.77 (1.26.1) server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → NeoForge 26.1.2.77 (1.26.1))
This server ended up working really well for an event, and handled a pretty powerful mod with several people online at once. The host/site UI is also easy to navigate, and makes everything pretty easy and accessible. Would definitely recommend and would use again.