Would only including the time (format=“LT”) clean up the presentation of the schedule a little?
Main event block
2023-05-04T08:00:00Z
9:00 AM→10:00 AM Tea and biscuits
10:00 AM→11:00 AM Sandwiches
11:00 AM→12:00 PM Break for lunch
[date-range from=2023-05-04T12:00:00 to=2023-05-04T13:00:00 format="LT" timezone="Europe/London"] Break for lunch