The <H1> heading is used by the script to give both the name of the dance series and its location eg, ".... Guildhall Barn Dances, Winchester":

    <H1>Guildhall Barn Dances, Winchester</H1>

This is for dance series at a specific location, where the dances are held in different places it is necessary to include the information as part of each event.

If a page holds details of events in different locations or if you want to include the map reference in the details (so it can appear in an image map) then a location tag is required for each event.