So i share a simply way for niebies...
1)Go to your datapack in data/scripts/cron/ directory
2)Create a file and name it tvt.py(py is the extension so if you create a txt file and rename it,remove the txt and add py)
3)Open the file and paste
import sys
from com.l2jfree.gameserver.model.entity.events import TvT
TvT.loadData()
TvT.autoEvent()
save and close it.
4)Finally add in your global tasks the following:
INSERT INTO `global_tasks` (`id`, `task`, `type`, `last_activation`, `param1`, `param2`, `param3`) VALUES
(996, 'jython', 'TYPE_FIXED_SHEDULED', 1206595935732, '60000', '14400000', 'tvt.py');
"param1" means time since server restart.So in what i share means that event will start 1 minite after restart
"param2" means how much time that the event will repeat.In what i share event will start automatic every 4 hours
You can change it by your needs(for example you may want every 3 hours)
Have fun.....