Kick-off is at 7pm and season ticket holders are entitled to free admission on production of their season ticket card.
All other supporters can gain free admission by clicking here and completing the voucher which you can hand in at the turnstiles. If you are unable to print this out now, pick up a voucher at the stadium this evening.
Tigers secured top spot in the northern conference of the 'A' League with a bonus-point win at Sale last Monday, while Saracens finished runners-up in the southern section.
Harlequins host Leeds Carnegie in the other semi-final, with this season's final scheduled for Monday, May 3 at a venue to be confirmed.