The Duke of Edinburgh will present medals to Royal Marines from 40 Commando in Taunton later. A homecoming parade will also take place on the High Street to mark their return from Afghanistan.
It will be a chance to remember the 18 Royal Marines who lost their lives during the decade-long conflict.
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Stephen Gilbert who was the constituency's MP from 2010-15 will contest the St Austell & Newquay seat for the Liberal Democrats on 8 June.
It'll be dry and sunny to begin with this Bank Holiday weekend in the West, but with showers just around the corner.
It's a mixed weekend for the South West ahead with sunshine on Saturday but rain and showers across Sunday and Monday.