Create one counter variable, int counter=0; and each time user buys ticket increment it by one or number of tickets buyed.(depends on you). After this use the below flurry code:
Map<String, String> params = new HashMap<String, String>();
params.put("NumTicketsBought", "" + counter);
FlurryAgent.logEvent("NumberOfTicketsBought", params);
In your flurry analytics check for event NumberOfTicketsBought, it will show you the count of tickets bought, hope this helps.