I got lucky and 3* event-4 on my second run, even though it looked like rng-hellish. Good luck to all of you i wish you won't struggle too much on this one like me !

I will add that i displayed ~16k squads with a very low speed helper (~350) for event-3. Two squad then died on the last boss, giving time for the others on top lane to finish the little ennemy spots. The helper went on the bottom and eventually killed the 2 bosses.
I thought i might as well share my experience in case some people had trouble with the map.

On a side note, i have to say it is really nice to have two events in a row without break, i hope it will go on like that. Good job nutaku !