Useful Event Planning Software

• LANREG - LANREG is an event registration web application designed to enable LAN party organizers to quickly and easily accept payments in advance for their events. LANREG supports user created seating charts, general admission ticketing, PayPal payment integration, and more.

• LanHUB - LanHUB is a web application designed to keep their players engaged. Hosted online, LanHUB can keep your party organized, and keep your players up to date with email reminders and announcements. Other features include no-registration signups, Twitch and Challonge tournament integration, and streaming radio.

• BYCEPS - BYCEPS is a self-hosted web platform to run LAN parties. Multiple brands, multiple sites, advanced ticketing, seating, native discussion board and shop, intranet mode, and more.

• Challonge - An online tournament manager, allowing easy generation and sharing of tournament brackets with a choice of tournament styles.

Feel free to suggest other/better/newer options. :)