Problems with artists

http://www.setlist.fm/setlists/glenn-frey-band-feat-joe-walsh-63da122f.html

This one has setlists assigned to it, so it may have been added that way deliberately? I am hesitant to merge it.

http://www.setlist.fm/setlists/teen-canteen-1bdb951c.html
http://www.setlist.fm/setlists/teencanteen-53d8830d.html

These are different artists according to MusicBrainz

http://www.setlist.fm/setlists/jan-delay-and-disko-no-1-2bd43cbe.html
http://www.setlist.fm/setlists/jan-delay-23d6d00b.html

I've been trying to add two setlists for a couple of days now and somethings wrong…
Both at Tyrolen, Alvesta, Sweden (Muskelrock) 2/6/2017.
Can someone tell me what's wrong?

Eddy Malm Band
0e64261e-1f09-46fa-925a-08f13a8892c8

Nebulous Aura
cb448f5f-4022-4487-a6ca-f677210fe616

Please merge

http://www.setlist.fm/stats/covered/harry-nilsson-7bd6d6c8.html
http://www.setlist.fm/stats/covered/nilsson-73d6d6c9.html

Please merge:
http://www.setlist.fm/setlists/colonel-mustard-7bde5a44.html
http://www.setlist.fm/setlists/colonel-mustard-and-the-dijon-5-43ce038b.html

Not duplicates according to MusicBrainz

Please merge:
http://www.setlist.fm/setlists/deutsch-amerikanische-freundschaft-bd6d572.html
http://www.setlist.fm/setlists/deutsch-amerikanische-freundschaft-daf-4bdcbf9e.html
http://www.setlist.fm/setlists/deutsch-amerikanische-freundschaft-daf-73de3e79.html

All three are the same band. The full band name is “Deutsch-Amerikanische Freundschaft”, but in many cases it is also called DAF or D.A.F.
https://en.wikipedia.org/wiki/Deutsch_Amerikanische_Freundschaft

How can I add an ““new artist”?
https://www.reservix.de/tickets-david-knopfler-band-with-special-guest-alan-clark-in-neuruppin-kulturkirche-am-24-6-2017/e903219

David Knopfler goes into tour with Alan Clark so I guess there should be “David Knopfler feat Alan Clarke” or “David Knopfler and Alan Clark”? Thanks!