PURPOSE Update tree view to add optional fields to make it easier to read. SPECIFICATION Modify the event_views files to add some fields (optional or not) It add some more informations about the seats, the tracks and sponsors and if the event is online or not. LINKS Task ID : 2192652 PR : #44938 Related: odoo/upgrade#801 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>