Build an event planning web app with: 1) Event creation form with title, date, time, location, description, cover image, and event type (conference, meetup, workshop, party) 2) Guest list management with import from CSV, manual entry, and contact grouping 3) RSVP tracking with attending, maybe, declined statuses and guest count 4) Event dashboard showing RSVP summary, guest list, and pending invitations 5) Seating arrangement tool with drag-and-drop table layout and guest assignment 6) Day-of-event timeline with task checklist, time blocks, and assigned team members 7) Budget tracker for venue, catering, AV, decorations with running total vs budget 8) Vendor contact directory with assigned categories and notes 9) Invitation system with email templates and send tracking 10) Post-event feedback collection form. Use a clean event-planning aesthetic with a calendar view and card-based event details.