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If a user has an event to share, they should be able to post something through the app that admin can review and approve/delete. This would be much more convenient than adding a clunky tagline to existing events, such as "Email Adam if you have an event or business you would like to include in this app." That takes them out of the app, and few people may take the time to do so.
Already getting many suggestions for this. Users are asking for a submission method to submit businesses, points of interests to the app for our consideration. Let's make it a priority.