A corporate event costs roughly €200 to €500+ per person ex. VAT for 250 to 500 guests. For 500 to 1,000 guests you should reckon on roughly €150 to €400+ per person. For 1,000 to 2,000 guests roughly €125 to €350+ per person. Above 2,000 guests roughly €100 to €300+ per person. All amounts excluding VAT, including venue, catering, entertainment and production.
The exact budget depends on the type, the venue and the programme.