I realise that this may be a slightly contentious topic and, perhaps, a generalistion. Please feel free to disagree as you see fit.
:-)

I've already been to a few festivals this year and have seen different acts perform. Many of these have also appeared at local folk clubs and "one off" concerts fairly recently.

Almost without exception, I have enjoyed hearing them in the festival setting better and also felt that they had "upped their game" too.

So, if you agree that this is a fairly common experience, what do you think the reasons could be?

Some possibilities......

1. Shorter, tighter sets rather than two plodding "halves". So, the band/artist is more selective about choice of material and there is also less time to "waffle" and ramble on between songs, sets, etc.

2. Use of professional sound engineers and good PA

3. Both the audience and artists are "up for it" and this helps to create a better atmosphere

4. Acts obviously wish to "raise their game" as there is more immediate competition and they would obviously like to be perceived favourably

5. Less distractions, i.e. from supports, long intervals, club raffles and so on

There may be other reasons or, maybe, you don't all agree?
Also, I would concur that there are also some folk club nights which can be very special and intimate whereas others just seem like a bit of chore at times for all parties concerned.