The following Liberal Democrat groups may interest you:
Association of Liberal Democrat Councillors
Association of Liberal Democrat Engineers and Scientists
Association of Liberal Democrat Trade Unionists
Ethnic Minorities Liberal Democrats
Green Liberal Democrats
Humanist and Secularist Liberal Democrats
LGBT+ Lib Dems
Liberal Democrat Christian Forum
Liberal Democrat Disability Association
Liberal Democrat Education Association
Liberal Democrat European Group
Liberal Democrats for Seekers of Sanctuary
Liberal Democrat Friends of Israel
Liberal Democrat Friends of Palestine
Lib Dem Group at the Local Government Association
Liberal Democrat History Group
Liberal Democrat Lawyers Association
Liberal Democrat Women
Liberal International British Group
Parliamentary Candidates Association
Young Liberals
Other Party Organisations