Sussex Clubs for Young People is reminding youth clubs that it will be easier to amend an existing public entertainment licence to a new-style premises licence before 6 August.
After this date, clubs will need to make a new application, which will involve a more complicated process.
The new regulations come into force on 24 November, after which all youth clubs will need to apply for a premises licence if they provide regulated entertainment.
This can include film showings, indoor sporting events, live or recorded music performance or the supply of late night refreshments between 11pm and 5am. It will make no difference whether the events are free or fee-charging.
Youth clubs should apply to their local district or borough council and name an adult who will be responsible for holding the licence.