The 4th National Congress of the Lao People's Revolutionary Party (LPRP) was held in

Vientiane Vientiane ( , ; lo, ວຽງຈັນ, ''Viangchan'', ) is the capital and largest city of Laos. Vientiane is divided administratively into 9 cities with a total area of only approx. 3,920 square kilometres and is located on the banks of ...

on 13–15 November 1986. The congress occurs once every five years. A total of 300 delegates represented the party's nearly 45,000 card-carrying members.ໜັງສືພິມ ປະຊາຊົນ
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References

Congresses of the Lao People's Revolutionary Party 1986 in Laos 1986 conferences {{Laos-stub