The 1,000gns and 2,000gns both close on March 7th and both cost 770 pounds to enter.
The Oaks also closes on March 7th and costs 800 pounds to enter.
If you are not already entered for the Derby then you can go in on April 4th for 8,000 pounds. Those 2nd entries also pay a more expensive (10,000 pounds) at the forfeit stage on May 18th.