During your journey on the Event's islands, you will meet characters that will block your way - Evil Totems. For interacting with them and in order for them to let you go forward, you will need Beaded Necklaces.
Please note, the Event is a monthly activity, so each month there will be new characters which will block the path and new resources for interacting with these characters. However, this article is being regularly updated. :)
Get rid of this Evil Totem and you're good to go ;)
Sometimes you can go short on Beaded Necklaces, so it is important to collect as many of them as possible. Here how you can gain them:
1) Free gift
You can receive a chest via Free gift option once per every 8 hours. Just press on the "Get gifts" icon and choose "Get free" option.
2) from special objects on the islands
On your adventures through the islands of the Event, you will find these special object (Bead tree). Cut your way through to reach it and you will be rewarded with additional Beaded Necklaces!
Also, you can use the Converter to exchange excessive resources for a set of other ones, though beware, as it is a matter of chance what Beaded necklaces exactly you will receive ;)
To learn more about the Converter just click on this link. (read it before using the Converter!)
You can also receive the needed resources as gifts from the game's Official Page on Facebook.