If you need extra allies, I have a lvl 38 Ares WL Vincent and 38 Ninja Kai and you can send me a private message with your ID so I can add you as well. You will probably need a Berserker Vincent ally though if you want an easier time as his DPS is just insane. Don't worry about not finishing the event as you've only started. You should maximize this event by training your heroes and upgrading your equipment so you can tackle the next events easier.
Might also want to maximize your heroes' aura direction as well. Probably need to put Isabella in the backline (Fun Fact: She was the most OP mage in CBT). Also, use those chicks when upgrading a 5* to +2.
You can also start playing PvP Arena. Don't worry about winning yet, you'll probably meet inactive players with full 5* teams. You will get gems at the end of the week regardless of your ranking. More free gems. Lastly, if you have a bit of money to spend, I'd suggest getting Emiko's package in the Bundle section of the shop. It's pretty cheap and gives you 25 gems everyday for a whole month.