If you are the only source and you wish to share, put it out for sure! no one that wants to hear the show or band will hold a grudge that you did the best you could. i have several examples of this. i taped a megadeth show in 2009 where i only got about an hour out of the 1.5 hour show. really disappointing and frustrating at the time but i was the only taper so it would be a shame for the show to not circulate just because i didnt want to share an incomplete. kylieshotpants has a really good suggestion in cases like this to just take the youtube audio and patch it. sure it sucks to have lossy mixed in but at least then you have a "complete" source. many shows are up in their entirety on youtube that are "stealth only."
another example is openers, especially for stealth jobs. ive taped many artists that i didnt go to see but were opening and happen to not be recorded much. i believe taping and circulating these sources is very valuable and underrated because of the rarity factor. again, if its the only source and an artist that doesn't get taped its best(IMO) to just go ahead and post.
moving on to a non-stealth standpoint, have multiple rigs will help out with this problem. in particular, it is good to run 2 rigs at a festival or other open taping situation where you may have battery or memory limits with your equipment. even if you are the only taper, when you have 2 recordings it is "OK" if one has a small gap or cut because you can always patch it later easily. having that said, running 2 rigs makes me a little more negligent in terms of making 1 "perfect" recording. hope this is good advice.