Europe has several groups like this. One event a day and then any number of announcements is fine, btw. You'll find it a huge energy drain unless you can make it self-sustaining with competent deputies and not having to individually ask people. For the same reason, consider holding them at the same time every day, at least until they gain momentum. People are very cattle-ish: individually wary and timid but herdable in larger numbers, though capable of stampeding, and treated well they produce the most delicious tender cuts.