The data collection technique proposed is a combination of quantitative and qualitative methods, such as surveys, interviews, focus group discussions, observation, and secondary data analysis. 

The timeline of the experimental activity is from June 2021 to February 2022, with four main events:  March 26, 2022: Street music performance at the west bank of Dragon Bridge  April 15, 2022: Street music performance at the half-moon area, Bach Dang street  April 22, 2022: Light up Da Nang event with street art and music at the same location  April 29, 2022: Light up Da Nang event with Korean-themed music and art at the same location 

Coordination and collaboration among the members of the working group, UNDP, and other relevant agencies and units.  Data collection and analysis to evaluate the impact and effectiveness of the experiment.  Communication and promotion to raise awareness and attract participation from the public and stakeholders.  Logistics and security to ensure the smooth and safe operation of the events. 

This experiment required several iterations, as the team had to adapt and adjust to the changing situation and feedback. Some of the changes and adjustments were:  The team had to postpone and reschedule some of the events due to the COVID-19 outbreak and the social distancing measures.  The team had to modify and refine some of the ideas and activities based on the input and suggestions from the stakeholders and the participants.  The team had to collect and analyze different types of data and evidence, such as surveys, interviews, observations, and media reports, to evaluate the impact and effectiveness of the experiment. 

Some of the advice that the team would give to someone wanting to replicate this experimental activity are:  Conduct a thorough research and analysis of the local context and needs, as well as the best practices and lessons learned from other cities and countries.  Engage and collaborate with a diverse and representative group of stakeholders, such as the government, the private sector, the civil society, and the academia, and ensure their participation and ownership throughout the process.  Design and implement the experiment in a flexible and iterative manner, and be ready to adapt and learn from the challenges and feedback.  Communicate and disseminate the results and recommendations widely and effectively, and seek for opportunities and partnerships to scale up and sustain the initiative. 

This experiment can be replicated in another thematic area or other SDGs, as the City Lab model is a versatile and adaptable approach that can be applied to various urban issues and domains. However, some of the factors that need to be considered are:  The specific characteristics and dynamics of the local context and the target group, such as the culture, the economy, the politics, and the environment.  The availability and accessibility of the data and evidence, as well as the tools and methods for collecting and analyzing them.  The legal and regulatory framework, as well as the institutional and organizational capacity, that enable or constrain the implementation of the experiment.  The potential risks and ethical implications, as well as the mitigation and safeguard measures, that might arise from the experiment. 

The “sense” and “explore” phases of the learning cycle influenced and shaped this experiment in several ways, such as:  They helped the team to identify and understand the problem and the opportunity, as well as the existing and potential solutions, for developing the night-time economy and tourism in Da Nang.  They enabled the team to map and engage with the relevant and influential stakeholders, and to build trust and rapport with them.  They inspired the team to generate and select creative and innovative ideas, and to design and plan the experiment in a participatory and inclusive way.  In hindsight, some of the things that the team would have done differently with their fellow Solution Mapper and Explorer are:  They would have conducted more field visits and observations, as well as more interviews and consultations, with the local businesses and residents, to gain more insights and feedback from their perspectives and experiences.  They would have involved more experts and practitioners from other cities and countries, who have experience and knowledge on the night-time economy and the City Lab model, to learn from their best practices and challenges.  They would have used more digital and online platforms and tools, such as social media, webinars, and online surveys, to communicate and interact with the stakeholders and the participants, especially during the COVID-19 pandemic. 

The high level of interest and enthusiasm from the stakeholders and the participants, who showed their support and appreciation for the initiative, and who actively contributed and engaged in the events and activities.  The positive and significant impact of the experiment, which not only increased the attractiveness and vibrancy of the night-time economy and tourism, but also enhanced the social cohesion and cultural diversity of the city.  The unexpected and emergent outcomes and learnings, which revealed new insights and opportunities, as well as new challenges and limitations, for developing the night-time economy and tourism in Da Nang.