Explore electromagnetic counterparts to decihertz gravitational wave sources in this conference talk from the Lunar Gravitational-Wave Detection discussion meeting. Delve into infrared and UV observations, upcoming missions, and comparisons between different observational approaches. Examine decihertz sources, follow-up strategies, and pre-merger pulsation searches. Investigate challenges in observing galactic double white dwarfs and their magnitudes. Learn about TMT capabilities and their implications for observations. Discuss supernovae observations in optical, infrared, and high-energy regimes. Gain insights into the current state and future prospects of multi-messenger astronomy, with a focus on gravitational wave sources in the decihertz band.