Memorial Day in the US is a national holiday to remember those that have died while serving in the US military. It is also the unofficial beginning of the summer and the start of the grilling / barbecuing season.
In the UK, Nation Barbecue Week is between 28th of May and 3rd of June, overlapping with the start of the Queen Elizabeth’s Diamond Jubilee celebrations.
Here’s a quick link to the Barbeque section of the website for ideas to keep you going through the summer.