Q:  I am currently seeking a classy dinner venue in Barcelona to accommodate 200 delegates for a sit down meal. We will also need space for entertainment. Can you recommend venues?

A: This type of enquiry is a specialist enquiry and you really need to consider a specialist events organizing firm here in Barcelona to help you organize this.
 
In terms of possible venues that can accommodate large numbers of delegates perhaps consider the large 5 star luxury hotels in Barcelona e.g. The Arts hotel.  Hilton Diagonal Mar Hotel, Eurostars Grand Marina hotel They have conference centres and can cater for large groups of people. You would need to confirm directly with these hotels to determine if they can supply what you are asking for.

I am sure there will be many other possible venues outside these large hotels however you would need to contact a specialist events planner in Barcelona to help you.