The city of Amsterdam is well-known for its creative citizens, innovative use of public spaces, and bottom up and informal (citizen) initiatives. Many of these initiatives are endorsed and - after some time - formalised by local government. However, some need to be relocated or disappear due to densification-strategies. This is particularly the case in contexts of urban growth and not unique for Amsterdam. Depending on the specific circumstances, densification strategies compensate densification with nature conservation and/or public space programs. Densification is a contested approach – chiefly because it often entails quantitative approaches that are abstracting specific places into numerical value and generalized policy ambitions that do not resonate with the creative language and practical wisdom and imagination at play in the specific places. Often, these strategies also involve uncertainty regarding their relationship with informal citizen initiatives. Particularly in the urban fringe, we see a variety of initiatives that have developed over the years and which have obtained temporary approval for their activities. In this pop-up research we explore if, and how techniques of research by design contribute to making productive these confrontations – between formal and informal resources, between practical wisdom and generalised knowledge, between local creative-artistic and more general quantitative approaches - with the broader aim to create more sustainable and liveable cities.