How do you implement regular design critiques with your team?

While researching design critiques, one suggestion I've seen is to have a schedule of regular--possibly weekly--critiques with a cross-disciplined group from a product team. While I like the idea in theory since it supports a culture we'd like to foster, I'm having a difficult time imagining how to make that work.

Does anyone have experience implementing regular design critiques as part of your team norm?

What changes did you have to make in how you worked? What roadblocks did you have to overcome? Were you able to regularly have designs to critique?