You can use the provider mode, so each website will use different provider for Pages, Content etc. Say you have website1, website2, website3. You could create three providers for Events ( for example) - website1, website2, website3. This will allow you to maintain the websites from one instance and even using a single data base if necessary. Of course the better option is using a separate database for each website. You can gather more information about the provider model at
Purpose of the Provider Model Design Pattern
- page 225 Adding providers section
Run Multiple Community Editon Sites from one SQL2009 Database?
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