Microsoft has compiled a file of 'all' Windows 2000 event ids.

Download Windows2000Events.exe and extract the Windows2000Events.csv file.

Here is a sample entry:

Message                                                                 Event   Event   Event Source            Event                                                                                                       Log     ID                             Type                              The directory service was unable to allocate a relative identifier.\r\n	System	8208	Active Directory	Error