Boutique Bar in Leeds, Socio Rehab in Manchester and The Peacock in Liverpool were the first to trial the events, which incorporate a rum spicing competition for bartenders, followed by a party in the evening.
Rumpus will now take the activity to venues in Bristol, Cardiff, Edinburgh, Birmingham, Oxford, Southampton and Nottingham.
Ten bartenders will be selected from each city and invited to create their own unique blend of spiced rum.
The winner of each regional competition will be awarded a cash prize of £250 and will be entered in to the national grand finale to be held in January 2010.
The parties will feature live entertainment and a complimentary cocktail reception as well as pampering from the Gecko Girls and bespoke cupcakes infused with Lamb's Spiced.
The events will also introduce six signature cocktails, which have been created by Lamb's Spiced Rum brand ambassador Gary Hayward.
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