English is not my first language, can I still take part?
I have no problem with people whose first language isn’t English taking part. Given the nature of the exercise, however, you should be comfortable that a native speaker would have no idea that English wasn’t your first language.
All the events held to date have had chapters submitted by people for whom English is a second language. In some cases, individuals have shared their chapter with someone else to do a quick review before submitting the final draft to me for inclusion in the books.