I agree that these examples are "better than the default" but still suffer from many AI-design bad smells. In terms of design, "style" (as in "Bauhaus" vs "Japanese" vs "Faux kid drawing") is less important than readability, economy and communication:

- The main issue with AI posters and flyers is almost uniform information density. They read as "too crowded". Posters should, like photographs or paintings, have a rhythm where some areas are high density and others act as negative space, and provide a more restful transition between information areas.

- The icons as bullet-points are a big AI cliche, and for the most part useless. Nobody needs an icon of a cupcake to understand what "cake" means and most of the other icons have no clear interpretation. Icons are only useful when, by themselves, communicate the idea (like the typical toilet icon). It's telling that every poster includes them.

- AI is not brave enough, or wise enough, to leave some blank space. Blank space is the #1 design resource.

- Font and visual style should not be arbitrary aesthetic choices, but rather motivated ones. They could relate to the event or the place through its history, culture, biome, or through the utopian vision of what the organizer is trying to bring to life. There should almost never be a legitimate choice between "Should we use Japanese, Punk or Kid-drawing style?"

- Being honest, earnest, truthful, is better than being cool.

- If a poster for an event calls your attention you can scan for the date, time and place. They will be there somewhere. But before you get there, there'll be important questions: "who organizes this?" "who is this for?" "what's the vibe going to be like?". Only a few of the posters try to partially provide this information through very small sentences (e.g., "A day of music, making and family fun")... but it's hardly enough. In my opinion this is what 80% of the time designing the poster should be spent on... looking nice and "professional" won't inspire trust or create commitment.