under normal circumstances I'd say 'yeah no worries', but next year is simply a bit of a different story.
it's the last year for space as well as for coxy. people are very much aware of that and therefore I predict especially tuesday nights to be extremely popular next summer. by that I mean every tuesday will be sold out or nearly sold out next season.
I'm not saying you have to hurry up and get the tickets right now, but if you do know you want to do this night, I'd get the tickets beforehand anytime between now and april. on-island pre-sale tickets won't be cheaper and I think that this coming summer, because of that special situation, they might even do without the well-known discounted entries by 9pm/11pm/midnight etc they used to work with.