Spirit Group is holding a two-day event of action to ensure its pubs are ready for the smoking ban.
Hundreds of employees of Spirit, and head office staff from its parent company Punch Taverns, will take part in the Help Stub It Out On Spirit Day event on 26 and 27 June.
Tasks will include tidying up outdoor areas, repairing and painting garden furniture, cutting grass and planting hanging baskets.
Indoors, it's all about eliminating odours by cleaning carpets and upholstery. Toilets, kitchens and bin areas will also get a thorough clean.
Spirit's business development managers will run through a final no-smoking checklist at each of their pubs to ensure statutory signage is in place and staff have been correctly trained on the law change.
Spirit Group's marketing director Jeremy Hipkiss said: "We want to make sure all our pubs are looking their very best once the smoking ban begins. The smoke-free environment will attract new customers into pubs and we have to make a positive impression to ensure their continued loyalty.
"Similarly, where outdoor facilities have been put in place for customers who still want to smoke they must look tidy and professional. We welcome the enthusiastic response from our team players who are prepared to put considerable time and effort into these final preparations for the ban."
Punch has spent £65 million preparing for the ban at its pubs during the last financial year.