I received a request to work at a corporate party with a special request for a group photo of +- 400 people. So far the largest I've had was aprox. 35 people. I work with a Canon Eos 550 and a 35mm or 18-200mm lens.

I would be a shot at the beginning of March between 17:00-18:00 in the Netherlands (meaning relatively little light & prob no direct sunlight). What approach would you recommend?

Thank you for your time,