For several decades now, Metro Manila's Baclaran district has been home to thousands of street vendors who have capitalised on its functions as a commercial centre, a transport node, and a Filipino Catholic devotional site. This presence of informal hawkers, which some government officials consider as an urban blight, has generated a range of policies that seek to manage, if not eradicate, the informal hawkers. Years of street occupancy, however, have enabled the tenacious vendors to enforce grassroots mechanisms to appropriate streetscapes. I refer to this interplay of state interventions and grassroots practices as the formal-informal interface. Seen from an urban planning perspective, the Baclaran context offers an opportunity for scholarly inquiry into how the complex spatio-political ordering and socio-economic realities unsettle the essentialist formal-versus-informal categories of work and state interventions. In sum, these findings reveal how understanding the formal-informal interface contributes to the evolving conceptual and empirical conversations on worlding cities. The Baclaran case shows how worlding practices arise from the interplay of global North-oriented planning ideals and policy approaches, the unequal socio-spatial relations, and the continuing struggle of marginalized street vendors in the global South. These issues require rethinking of policy direction and planning trajectory.iii