- attending someone else's wedding/birthday party/random party;
Unless it was a very close family member or friend and you had no other possible way of getting to it - and a wedding is a very different matter to a random party BTW - YANBU.
- presents
If we are talking about Christmas or Birthday presents for DC, and you have literally no other way of affording them then I would take a small loan. Not to buy the latest, expensive, electrical things or designer clothes but to make sure they have something.
- a loan to a 'friend'
YANBU. I don't understand why people do this (apart from that they are kind to a fault). My understanding is that if you cannot comfortably afford to lend the money, you do not lend it.
- random junk that you don't need but want to keep up with the Joneses
YANBU.
Although it really is none of my business what other people chose to spend money on, whether they are borrowing it or not.