I'm a fool.
But just to be safe. The Party is at 01:00 AM GMT on April 5 correct? By that calculation it would place the party at 8:00pm EST on April 4th.
The reason I bring this up is because for this week only, European & US clocks are an extra hour off. Europe went to BST or "British Summer Time" on March 30. The US goes on DST or "Daylight Saving Time" (Spring forward) on April 6.
The "Are you a Fool?" party is on April 4th at 8pm EST.
But as long as you remember 1:00AM GMT you'll be fine..