Thanks. I think I can answer for many organisations that aspire to be democratic, eg trade union branches and voluntary associations and clubs.
1. Candidates are elected as individuals, i.e the members vote for individuals (whether the system is the first 10 or whatever past the post or the single transferable vote). Candidates are nominated by branches.
2. The slate system is not applied, particularly not by an outgoing committee proposing the slate as that means committees perpetuating themselves through co-optation.
3. The Conference agenda is set by branches proposing motions. The executive committee cannot propose motions.
4. Branches elect their own organisers who are responsible to them.
5. So your party is not as bad as the AWL whose
constitution includes this rule: "Branch or fraction organisers can give binding instructions to activists in their areas on all day today matters."
The main difference between this democratic form of organisation and the Leninist model is that the executive bodies do not propose their own slate of candidates and do not set the Conference agenda and so a self-perpetuating leadership which can get the policies it favours adopted is made more difficult (as opposed to encouraged, in fact institutionalised, in the Leninist model).