Hi Julie626
Are you aware of The Music Club http://www.music4disabledchildren.org.uk? They hold regular events in South Oxfordshire.
Another option might be the Nightclub/Disco events in Wantage. Details can be found here: https://forum.ldox.org/t/nightclub-disco-for-adults-with-learning-difficulties-wantage/165 Beware though that the venue is unfortunately not accessible to people who use wheelchairs.
Hopefully some other members will add to the suggestions already made.