It doesn't come much bigger than this - one chance for either team to book a place in the final at Twickenham.
The Final Whistle bar is open from 1pm, and you can watch live coverage of the other semi-final between Northampton Saints and Saracens before taking your seats for Tigers against Bath.
Outside the stadium, the interactive games are back, with the Guinness Power Pass and Rugby Reflex adding to the pre-match build-up, allowing you to test your skills against the professionals.
Find out how you could win a £40,000 BMW in an exclusive Spot The Ball competition with Ben Kay's Testimonial committee.
Sunday is sure to be a colourful occasion, so make sure you wear your Tigers colours with pride. And bring your Tigers flag!
Enjoy Sky Sports commentary via the Guinness Premiership Live service and share in the best matchday atmosphere in rugby.
As well as the breathless action of a winner-takes-all semi-final, there is the chance to win with Coral, the official gaming and betting partner of the Guinness Premiership, in the Hi-Lo Challenge on the pitch at half-time.
Match tickets are available now at special discounted prices. Adult tickets cost from just £18, juniors from £7. Season ticket holders pay from £15 adults/£5 juniors for this huge Welford Road occasion.
Phone the Tigers ticket hotline NOW on 0844 856 1880, book online or call in at Welford Road. The office is open 8.30am-5pm on Friday, 9am-5pm on Saturday and from 9am on matchday.
Season ticket holders should phone or call in person to claim their special rates.