From time to time, there may be some alterations to the event you have purchased tickets for.
Unfortunately, lineups are always subject to change as explained in the Terms and Conditions you accept when you buy a ticket. As follows:
10.3 The promoter reserves the right to alter or vary the programme of an event without being obliged to refund or exchange tickets
Sadly, you are not entitled to a refund should the headlining artist(s) change from the one listed, or if another artist(s) advertised to perform, drops out.
Ultimately all refund decisions outside of event cancellations/postponements/venue changes do lie solely with the promoters.
If you're really unhappy and want to make your comments heard or would like to request a refund, we find that event organisers are most responsive on social media and our best advice would be to contact them directly on Facebook or on their own website for further guidance.
We're sorry for any disappointment this causes but hope that this clarifies the matter.
Why not go to the event anyway? You might find out you like it - Nirvana once replaced Pearl Jam in Seattle...