def non_harris_event_cols(class_year, num_rows):
"""Add columns for non-Harris events. These can be auto-populated if Harris
package events include them (look in config.py). They are initialized to all
blank."""
blank_col = DataColumn.init_with(num_rows, '')
return ColumnGroup([
(format_as_event_header(event_id, "NH"), blank_col)
for event_id in config.non_harris_events_for_year(class_year)
])
