Zandel raised a good point there. The first few stages of the gacha event - those offering only basic lvl 5 manyus and dragons, are not worth it, and can be skipped as soon as available once you get the necessary item from it. Once you get to the lvl 20 items, then it starts to get more interesting.

I for now am sitting on all the dolls and those tacos or what they are that summon the special stage. Have 16K event currency, and will wait till phase two more expensive summoned stage is available to cut down on the times to runs this and clear the gacha in one go.
But tis be true, the early stages are not exactly worth it so skipping them as soon as possible might be a good idea to save myself some time if possible. Despite saying that its good to go for full clear, the truth is, I have very little use for the lvl 5 items, since all of my girls (2 and 3* included) are all above lvl 35, so the manyus are almost worthless and unless I wanna evolve the low rarity girls the dragons wont see any action either.