Export any reports you want to keep.

Take a database dump.

Remove all accounts, tickets, invoices, talks, etc. I used the commands below, but this may be simpler to achieve by selecting the relevant users in the Django Admin, selecting "Delete" and letting the cascading deletes deal with it.

```
Replace USERNAMES_TO_KEEP with an array of staff usernames.

$ sudo -u postgres psql symposion
delete from registrasion_lineitem;
delete from registrasion_manualpayment;
delete from registripe_stripepayment;
delete from registrasion_creditnote;
delete from registrasion_paymentbase;
delete from registrasion_invoice;
delete from registrasion_cart_vouchers;
delete from registrasion_productitem;
delete from registrasion_discountitem;
delete from registrasion_cart;
delete from pinaxcon_registrasion_attendeeprofile;
delete from registrasion_attendeeprofilebase;
delete from registrasion_attendee;

delete from proposals_aiandmachinelearningproposal;
delete from proposals_diversityequityandinclusionproposal;
delete from proposals_fossandarm64proposal;
delete from proposals_fossfundingandeconomicsproposal;
delete from proposals_fossindailylifeproposal;
delete from proposals_fossineducationproposal;
delete from proposals_keynotepanelproposal;
delete from proposals_licensingandlegalissuesproposal;
delete from proposals_memberprojectsproposal;
delete from proposals_mobiledeviceuserfreedomproposal;
delete from proposals_reproducibilityproposal;
delete from proposals_righttorepairproposal;
delete from proposals_scienceofcommunityproposal;
delete from proposals_seleniumproposal;
delete from proposals_supportingusergroupsproposal;
delete from proposals_talkproposal;
delete from proposals_tutorialproposal;
delete from proposals_wildcardproposal;
delete from proposals_xmppproposal;

delete from symposion_reviews_proposalresult;
delete from symposion_reviews_resultnotification;
delete from symposion_schedule_presentation_additional_speakers;
delete from symposion_schedule_presentation;
delete from symposion_reviews_latestvote;
delete from symposion_reviews_proposalmessage;
delete from symposion_proposals_additionalspeaker;
delete from symposion_proposals_supportingdocument;
delete from symposion_proposals_proposalbase;

delete from account_account where user_id in (select id from auth_user where username not in USERNAMES_TO_KEEP);
delete from account_emailconfirmation;
delete from account_emailaddress where user_id in (select id from auth_user where username not in USERNAMES_TO_KEEP);

delete from symposion_speakers_speaker;
delete from reversion_version;
delete from reversion_revision;
delete from teams_membership;
delete from pinax_stripe_card;
delete from pinax_stripe_charge;
delete from pinax_stripe_customer;
delete from django_admin_log;

delete from auth_user where username not in USERNAMES_TO_KEEP;
```

Set any remaining account `completed_registration` to false.

Add a new Conference entry in Django Admin and update the `CONFERENCE_ID` in pinaxcon/settings.py. Also update the conference dates.

Find and update all uses of 2025 and the conference dates in this codebase.

Update flatpages such as the "/" home page.

Update the Django "site" in the Admin.