https://forums.lineage2.com/topic/13592-preliminary-details-15th-anniversary-–-the-ultimate-celebration/
Hime said those will be deleted, quite unclear but if those thousands logged for solely said weapons then disabling it will reduce the latency we facing right now.
I am aware of those logged before event start but to tell them to restart the server now is not possible (they are not in their office yet) unless they do it for small fix or patch then Juji need to login and give GMbuff 8hrs again and I am pretty sure he does not like it at all
extending the event will please many people as weapon rewards they can give it thru other means