def METHOD_NAME(self, event, **kwdict):
    r"""Calls an event function, if it exists.
    Parameters
    ----------
    event : str, unicode
        The event name, which is handled by a function called `event_[event
        name]`.
    **kwdict : dict
        A keyword dictionary with event-specific keywords.
    Returns
    -------
    The return value of the event function, or None if no event function
    exists.
    """
    if hasattr(self, u'event_%s' % event):
        return getattr(self, u'event_%s' % event)(**kwdict)