Doorkeeper is an event management platform from Doorkeeper Inc. for hosting seminars, workshops, and community events. Organizers can create event pages, set up multiple ticket types with early bird or student discounts, and collect prepaid fees to improve attendance rates.

The platform supports diverse payment methods including credit card via Stripe, bank transfer, and convenience store payment. Subscription billing lets communities collect ongoing monthly or annual support from members. Organizers can also manage private communities and set administrator permissions for team-based event operations.

The platform provides an English interface alongside Japanese, supporting international event organizers and participants in Japan.