How to win in the gathering event in last shelter?

The gathering event just requires you to send your APC's out to gather resources. Start as early as you can on the event, even before the event starts if you can as the points are only awarded when your troops return to base and the resources are added. Gather as much as you can during the day. Make sure you return any gsathering APCs to get the points before the end of the event.

If you are able to, use a gather bonus buff (purchasable from the alliance store) this speeds up gathering which lets you get more points. If you have a Clash of zones core bonus (50% or 100% ticket) hen use this just before you return APC's to the city. This will increase your points. Also make sure you research in the Zone Commemoration tree to improve COZ score in general.