Hi, the event is actually ok to play with +600 atk beast monsters available from the trader and all those N & R tickets we get all time. Just dueling and having fun racking wins for the rank duels prizes and trying to add character skills with a run & gun deck
If you’re new there are some cheap options you can get very early, like Ojamas which are one of the first cards you get in GX world, add some f2p backrow like Half Counter and Enemy Controller and you can play.
So don't worry about those tickets going to waste, you'll eventually get so many, you won't see the need for them anymore. Besides, the cards in those non-ranked N & R tickets are not THAT good anyway.
And if I may ask, is this your first Duel Carnival or something? :)
In Duel Carnival event, the type always change every few days. So that's something to keep in mind for the next Duel Carnival.