Personally, I see it as a HoHoA (Hash of Hash of Array). Use the food as the initial key, with the time being the next key, and the attendees in the array. The data could be something like this:

my %schedule = (
        'pizza' => {
                '10:00' => [ 'SAM', 'LUSI' ],
                '10:30' => [ 'MARY', 'RICK', 'DON' ],
                '11:00' => [ 'LARRY' ],
                '11:30' => [ 'ED', 'SUE' ],
                '12:00' => [ ],
                },
        'seafood' => {
                '10:00' => [ 'KIN' ],
                '10:30' => [ 'KHAN', 'MIKE' ],
                '11:00' => [ 'YOUND' ],
                '11:30' => [ 'TK' ],
                '12:00' => [ 'DANNY', 'MONK' ],
                },
        );
[download]

It's a little advanced for a beginner, but the data is definitely there and accessible. HTH.