The anti-establishment 5-Star Movement (M5S) launched "new reforms for the country" at its 10th anniversary bash in Naples at the weekend, leader Luigi Di Maio said.
"We need new reforms that put Italy in step with the times," he said.
Co-founder Beppe Grillo, the stand-up comedian turned politician, closed the 10th birthday celebration on Sunday.
Grillo's presence at the two-day celebration had been in doubt.
M5S political leader Di Maio, the foreign minister, led a delegation of M5S ministers at the event.
Among the guests were economist Gunter Pauli, among the creators of the 'blue economy', the M5S blog said.
Paul and other M5S exponents spoke to an event called I am the future, the blog said.
Grillo founded the M5S 10 years ago with late co-founder Gianroberto Casaleggio, a tech guru and political thinker.
Casaleggio's son Davide was again among the keynote speakers at the 12-13 October rally at Naples Arena Flegrea.
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