I need an experienced Event Manager to organize a great Conference in Barcelona

My association is going to organize a one-day event for 600: it's a knowledge spreading event towards the community of Barcelona. Basically, it's a one afternoon cycle of conferences: we are going to have up to 10 speakers on the stage. The event involve also an exhibition during the event break and an after event dinner only for speakers and organizers (not for the attendees). The Event Manager must be responsible of the full event: location logistics, speakers logistic, exhibitors logistic, volunteer coordination. The content side of the conference is already sorted: we need an operation support so that the event can flow smoothly. It's a punctual project, but with the opportunity to extend the collaboration to other event we organize during the year. We need a person asap: the event is in Barcelona the 7th of October. During that week we need a 5/7 days 8/8 hours availability; the previous 3 weeks the work load will get bigger and bigger but we recognize we don't need a full time commitment. Physical presence in Barcelona needed.