human
I wrote the below code

    def gen_date_interleavings():
        for (e1, e2, t1, t2) in product(*([critical_dates] * 4)):
            if (e1 < e2):
                (yield (e1, e2, t1, t2))
    event_frames = []
    for (sid, (e1, e2, t1, t2)) in enumerate(gen_date_interleavings()):
        event_frames.append(make_events_for_sid(sid, [e1, e2], [t1, t2]))
    if add_nulls:
        for date in critical_dates:
            event_frames.append(make_null_event_date_events(np.arange((sid + 1)), timestamp=date))
    return pd.concat(event_frames, ignore_index=True)

What's a good function header?
assistant
#Here's a good function header.

def make_events(add_nulls):