It's a pity that you will not be able to attend HiveFest! It could be once in a lifetime event, as it is rarely held in Asia, and especially so close to you... 😃
Finally, it's about health. I recently went on a trip and shortly after I returned, I fell sick.
Something similar happens to me when I take longer trips... If it is over 3 weeks, I almost always get sick, and sometimes, on the trip too! I had a talk with a doctor about it, and there is a logical answer why that happens... Change of climate, food, routines, etc. If you "survive" 4-5 weeks in the new surroundings, when you come back, you are at risk of getting sick, as your body needs new accommodation time...
You probably had the second case... Glad to hear that you got well!