Should I Tri Harder?

Last week I was away on "holiday" with the in-laws. Holiday only in the sense that I wasn't at home, but in terms of a relaxing week away from stress it was an epic fail. God the in-laws are slow, and their extended family (that were also with us) are even slower. Never have my days been so filled with doing nothing, and when we did do something it was invariably sauntering round a Bakewell-esque town visiting tedious shop after tedious shop or handing over vast sums of money to look round a building which looks, in broad terms, exactly the same as the building we looked round yesterday. And even more gallingly is broadly the same as any number of NT properties that I can visit for free. A great holiday.
Anyway I managed to sneak out for a Cornice session with Guru. I failed to redpoint That Was The Sea and he made Ouijaboard look very hard, but did at least manage to tick it. In a strange reversal of fortunes it was the Guru who was time limited and we beat a hasty retreat.
I also managed an early morning run one day and got a PB time, which I wasn't expecting because I felt awful and heavy and slow whilst running. Anyway 5k in 22mins 17s, which gives an average of about 13.5kph.
Then on the way home I stopped at my dads for a couple of days and managed to get out for another run, 5.6k this time in 24min dead. Average speed of 14kph, which gives a 5k time of just under twenty-one and a half minutes, so getting close to the 21min target.
Since getting back home I haven't climbed, or run but have been swimming again. I felt very tired and my legs were strangely sore. I did another 8 minute 16 lengths breast stroke. I then tried to refine my crawl technique by doing short two length sprints. I managed a series of sprints of between 40 and 45 seconds. To be honest it was a pretty poor session, I was having issues with contact lenses and goggles which were really distracting. It's frustrating when things like this are the cause of disruption as I'm not sure I can really pin down what was wrong. It would be annoying to have a contact lens that feels wrong on race day and yet it seems I can't really do anything about it. Hmmm...
Anyway as has become apparent my climbing frequency has taken a bit of a hit, I'm hoping this is down to summer holiday based busyness but I fear that tri training may be a significant factor. And this is without any bike work (still not sorted a bike out) which will probably be the event that will need the most work, and take the most time. So I need to decide whether I just want to turn up for this tri and just get round the course in any time or do I want to give it a decent go and try and post a respectable time? I'm still thinking the latter, but climbing goals need ticking too.