To host a successful HEAL (Healthcare, Education, and Artificial Intelligence) conference, careful planning and execution are paramount. First and foremost, it's crucial to establish clear objectives that outline the conference's purpose, whether it's to facilitate networking, share groundbreaking research, or educate participants on the intersection of AI with healthcare and education. 

Diversify your lineup of speakers, drawing from experts across healthcare, education, and AI fields, to ensure a comprehensive perspective. Craft an engaging agenda that incorporates a mix of keynote speeches, panel discussions, workshops, and breakout sessions to cater to a diverse audience. 

Embrace interactive technologies such as virtual reality (VR) demonstrations, AI-powered chatbots for Q&A sessions, or real-time polling to enhance participant engagement. Tailor the content to suit the knowledge levels and interests of your target audience, offering both introductory and advanced sessions.

Foster networking opportunities before, during, and after the event, harness the power of social media and partnerships for promotion, and prioritize accessibility by providing translation services and accommodating different time zones for global reach. Seek sponsorships and grants, gather participant feedback for continuous improvement, and establish a content repository for post-conference access. 

Sustainability considerations and contingency plans should not be overlooked, and post-conference engagement efforts will help maintain the community's momentum. By consistently refining these strategies, your HEAL conference can succeed in fostering collaboration and knowledge exchange among attendees.