I like the font used on design #3. The symbol on #3 is also interesting, but I'm not entirely sure what it means. Maybe we could create a symbol with a similar structure that could convey something about cooperation or something about parties/festivities
#4 has great potential. However I dont think the colors are right. I think the orange should be a little more orange. Its a little too yellow right now. Also, maybe we can try another version in red.