It is entirely up to the licensee of any pub or club to decide where and when he/she allows children on the premises. 9pm seems a common time for children to be out of the pub building itself. Pubs which serve meals are far more likely to allow children (for a meal) than pubs which do not.
Given that Skegness is still quite a popular seaside holiday spot I suspect a few pubs and possibly some clubs will cater for children, but certainly not all.
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