Organisers hope to support schemes like the Storth post office project, which saw residents of the South Lakeland village save their post office from closure by turning it into a community run venture.
The closure of the local post office also led to far fewer opportunities for social interaction, with people reporting an increase in isolation and loneliness.
Leanne Wood (Plaid Cymru, South Wales Central) asked the First Minister to express disgust at Labour MPs who voted for the closure and are now campaigning to keep post offices open areas.
The planned closure at Llanfihangel Talyllyn is not part of the Urban Network Reinvention Programme which is leading to many post offices in towns closing their doors.