Actually, this event was pretty easy for me. Aside for Gallus, I obtained every helper for free from participating in and completing previous events. During this event, Gallus was on sale for two hundred fifty gems and since I had over three thousand gems, I bought him. I did have problems with the community event, though. From the Friday when the event started, until the following Monday morning, none of the ponies had multipliers.
https://youtu.be/7yVCYFD6flU?t=24
there are a lot more ways to get gems and everything can now be got for free (provided that you are lucky)