With an ever-growing world population, mass incidents like those at the Astroworld Festival in 2021 and Halloween in Seoul in 2022 may occur more often. Crowd management, with artificial intelligence (AI) as a promising tool, can offer solutions. AI can analyze crowds, predict escalations, and enable early interventions. Detecting group emotion plays a crucial role, which can be achieved through various data modalities, each with its own advantages and disadvantages. Multi-agent simulation models then predict emotional contagion effects in crowds. Various considerations are discussed, with privacy, validity, and applicability being central.