Phuket Festivals and Events in 2018, celebrated in Phuket are the following, in case you should have the time to enjoy one of them. Chinese New Year, this year it's on the 15th of February, The Wat Chalong Fair starts on the 9th of February goes on until the 16th. Thao Thepkasattri - Thao Sri Suntorn Festival is celebrated from 2nd to 17th of March. Later in the month of March you have Phuket International Marine Expo (PIMEX) 21st of March until 24th, at the Royal Phuket Marina.
In April we kick off with Phuket Bike Week April 11-19 in Patong Beach, then roll on with Songkran festival 13-15 April. Phuket Pride Festival, April 21 - 27 also in Patong Beach. In June Phuket hosts the Baba (Peranakan) Wedding Festival, on June 22 -24 in Old Phuket Town. In July we got the Kathu Festival on 22 - 24, located near Kathu market, and also in July you have Cape Panwa Hotel Phuket Race Week on the 16-20th of July. September brings us Por Tor Festival, and in October the Phuket Vegetarian Festival starts on 23rd September and goes on to the 3rd October. November is the month when Loy Kratong Festival is celebrated on the 7th, Laguna Phuket Triathlon will also be held during this month on the 24th. In December Phuket King's Cup Regatta is held on Kata Beach (30th November - 6 December).
That pretty much makes up what is going on this year. If you have the chance you should visit during the Songkran Festival or Phuket Vegetarian Festival.