Community-based participatory research (CBPR) can help increase the attendance in community programs. Padres Informados, Jovenes Preparados (PIJP) is a program that aims to prevent tobacco and other substance use among Latino youth by promoting positive parenting. Although the trial used CBPR approaches, attendance was inconsistent. In the present study, factors associated with attendance and nonattendance and recommendations to maximize participation were explored in 12 brief feedback discussions (BFDs) with participants and in 10 in-depth interviews (IDIs) with facilitators who delivered PIJP. Content analysis guided two pairs of researchers, who independently coded emerging themes and categories (κ =.86 for BFDs and.73 for IDIs). Data from BFDs and IDIs were merged and interpreted together. We grouped factors that positively affected participation into three categories: individual and family (e.g., motivation), program (e.g., offering food and childcare and having facilitators who are trusted), and research (e.g., having incentives). Barriers to participation were grouped into four categories: individual and family (e.g., family conflicts), sociocultural (e.g., community and cultural beliefs), program (e.g., fixed schedules), and research (e.g., recruitment procedures). Participants provided recommendations to address all types of barriers. Although PIJP used CBPR, complete satisfaction of community needs is difficult. Effective community programs must address participants’ needs and preferences.