Gosh the times I've been asked for help and not been happy to give it have been very few, and equally I certainly can't remember a time when I've asked for help and not been given it.
I'm lucky enough to inhabit a world where my neighbours help me with my gardening, or to put up a curtain rail. In one where I will happily give people a lift in the evening to save them a walk. In one where I ask someone to pick something up from a shop for me and they say it's not a problem. One where people will bring me meals if I'm unwell, and I'll do their washing if their washing machine is broken. I've even (gasp) picked up hitchhikers and been helped when hitching a lift with a bike with a punctured tyre. When my friends needed help with DIY, they ask if I can come and help them - the answer is of course.
I think the difference is that I tend not to view helping people as trouble. I enjoy helping people, even those I don't know, because to me that's the very essence of humanity - the glue of a society in the care we take for strangers, in the actions we take to make others lives easier. And when other people do the same, everyone wins, because we can support other people in their burdens and they in ours.
There are many circumstances under which asking someone to move seats in a theatre might be a big deal. If they have an aisle seat, if it would involve moving rows. In this instance no one has to swap, everyone can move one towards the centre (or the edge, as preferred by them), remaining sitting next to exactly the same people as before except on one end of the five where instead of sitting next to a six year old they are now sat next to a different random person that they don't know. Obviously this doesn't stand if there's eg a pillar or conductor in the way.
In this instance it looks likely that hopefully the OP got the days muddled so fingers crossed they don't have to risk frustrating anyone.