Event organizers, exhibition companies, and conference planners typically run their operations across a spreadsheet for the floor plan, an external ticketing platform for registration, email threads for exhibitors and sponsors, and ERPNext only at the very end for the invoice. The result is double-entry, reconciliation headaches, and no single source of truth for who is attending, which booths are sold, and which sponsors have paid. ERPNext core has strong Selling, Payments, and CRM foundations, but it ships no native concept of an Event, a Session, a Ticket Type with capacity, a Booth on a floor, or an Exhibitor — so the moment you try to sell a paid ticket against seat inventory or allocate booth A-14 to a specific exhibitor, native runs out of road.

We build a proper Frappe app (its own installable app in your bench, not a pile of Custom Fields) that models the domain as first-class DocTypes: Event, Event Session, Ticket Type, Attendee Registration, Booth, Exhibitor, and Sponsorship. Ticket capacity and booth availability are enforced server-side through validating doc events wired in hooks.py (validate, before_submit, on_submit) plus atomic frappe.db locking on the seat/booth counter, so two concurrent registrations can never oversell the same allotment. Paid tickets are gated: a registration cannot be marked confirmed until a linked Payment Entry or Payment Request settles, using ERPNext's native payments and your existing gateway, and the app reuses ERPNext's Sales Invoice / Payment Entry ledger rather than inventing a parallel accounting trail.

Registration itself runs through whitelisted methods exposed on the Frappe REST API (/api/method/...), so your public microsite, a printed QR badge, or an on-site check-in scanner all POST into the same validated backend. Client Scripts drive the desk experience — live remaining-capacity indicators, session conflict warnings, booth-map field toggles — while Server Scripts and scheduler events (Scheduler Event / cron entries in hooks.py) handle the background work: emailing e-tickets on confirmation, sending T-minus reminders, releasing expired holds, and rolling up sponsor payment status. Access is controlled with dedicated Role Profiles and permission rules so your box-office staff, exhibitor-relations team, and finance each see only their surface, and every DocType carries full audit trail and workflow states.

Because this is build-to-order, nothing is a generic download. It starts with a scoping call where we map your event types, ticket tiers, badge and floor-plan rules, and payment flow, then we build your version of the app, test it on a staging bench, and install it into your ERPNext site. Typical delivery is one working week from confirmed scope, targeting Frappe/ERPNext v15 and v16, and you receive the full source and git repository at handover so nothing is locked to us.