In the present study we adopt a person-centered perspective to understand how daily work unfolds. We used a 5-day diary study with 350 employees to: (a) identify distinct profiles of important daily work events based on their underlying psychological characteristics, (b) examine the stability of these profiles, and (c) test a theoretical model linking event profiles to momentary emotional intelligence (EI) dimensions and change-oriented organizational citizenship behavior (OCB-CH) enactment. Latent profile analysis revealed five distinct event profiles: the "ideal productive day", "demanding but manageable day" "relaxed social day", "challenging interpersonal day", and "crisis/toxic day". Day-to-day transition analysis showed that profile membership was highly dynamic, though the "ideal productive day" emerged as a stable attractor state and was associated with the highest levels of OCB-CH, an indirect relationship through the use of emotions dimension of EI. In contrast, "challenging interpersonal" and "crisis/toxic" days triggered regulatory and monitoring aspects of EI but failed to foster functional emotional use. Interpreted through event system theory and the episodic model of EI, our findings show how daily events trigger distinct psychological processes that enable or constrain proactive contributions.