def METHOD_NAME(df_anom):
    top_20 = df_anom.groupby("name").size().sort_values(ascending=False)[:20].index.to_list()
    plt.figure(figsize=(16, 6))
    df = df_anom[df_anom.name.isin(top_20)]
    sns.stripplot(x="name", y="date", data=df, hue="event")