Creating Seemless CDs from SONAR

I think that you will have to get a specialized CD burning software for the features you are requesting.  Maybe there are some freeware/shareware ones that would work if you search for some.

I have been using a program called CDBurnerXP - and despite the name it will work on Windows (https://cdburnerxp.se/en/home). It allows you to create CDs with no gap between tracks. It is free, and a pretty good program.
 
Hope that helps

I have CD Architect and can vouch that it'll do what you're asking.  As Bit said, it's $100.
Have used Nero as well.  They are both capable of burning with CD text.
 
Use Wavelab now (LOT more expensive, but will do LOTS more stuff)...
 
 

I use Nero "BurningROM" for all my audio CD burning.  Along with the Redbook burning and other features such as adding ISRC Codes, song titles, etc it is the only program I've found that will burn to multiple drives at the same time. 

+1 for Sony CD Architect. 
I used to use it often, and it did exactly what you're asking for.  Now I upload my stuff to CDBaby, along with MP3 distribution.  They cover all that (for a fee, of course).

+ however many for CDA

 I'm not sure if adding markers would be anything a consumer CD player could access. As far as I know you have to create tracks to be able to jump to different songs in a concert. 
I have recorded many live concerts which I then edit in Wave lab. 
I record whole sections using the program to determine if I'll get a break point in the show to stop and save
You often have dead air and shuffling feet as people move on and off stage. 
My trick is  to fade the applause quickly and cut the front end of the next song at the point where the intro begins.
If there is no place to do this, like when the intro starts as the applause is still dying down, you just cut hard at that point just before the talking and that will be the transition.  
 
I have always used Nero through a dozen versions. I have 7 now. 
It will allow you to have no space between songs. The end result for me is a pretty seamless flow of the concert. 
The fade out distracts you from the cut point and sounds more natural than an abrupt cut.  But depending on the player,you often won't hear the abrupt track change at all. 
So fire up your copy of Nero and see what you can do.
 
Of course keep your original recording as a back up before you start chopping.
And a Wave editor does this better than Sonar that is what wave editors are for. 
You can get very microscopic. 
 

What I meant by markers is that I want to construct the flow of the music across the whole disk, and then indicate where tracks will break but without changing what I have just created in any way at the track boundaries.  I do something like Cactus.   Usually, I find a quiet spot during the concert but with room ambiance.  I then splice a small section of that in between songs, sometimes fading the clapping if necessary before my ambiance.  It sounds like a running live concert but without the clapping and other distracting noises between songs.   That is sometimes a bit tricky, so I want to use the full power of the DAW to get the transitions I want.  I used to use Adobe Audition for this, but I recently switched to SONAR as it is more powerful.  To create the audio CD in Nero, then I had to export each track segment of the concert into a separate 44/16 file, and then insert the separate files as tracks into Nero and set for no silent break between tracks and no normalize.   That is a lot of work.  Audition actually has a feature that will export each section between markers into separate files as a single command, and this helps.  (Some versions of Audition will actually create the CD directly, but not mine.)  This has worked for me.  However, I know that there are standards for where CD tracks start and end, and SONAR or Audition don't account for that when I place my markers and divide into tracks.   So I am worried Nero might have to make some small adjustments to individual track lengths, for example, to make sure the CD specs are followed.   That is why I wanted software that would create the CD and tracks from my continuous processed stream, while making sure any track boundaries meet CD standards.  Ideally, SONAR itself would let me create CD track markers and provide the CD burn or DDP file from that. 
 
The HOFA CD Burn adds the missing feature.   It will not recognize the markers I created in SONAR.   However, I can export the full concert as a single 44/16 file, import that into HOFA, place markers where I want tracks to start, fill in the CD text for any tracks I want, and it either burns a CD or creates a DDP file for the production house.  HOFA makes sure any track markers I insert fit the CD standards.  I purchased the standalone version, but it also comes as a plugin.   And now, anyway, there are English language versions. 
 
As always, there are many ways of doing things.   SONAR has a lot of mastering features, but is not designed primarily as a mastering system.  And it does not give as much detailed wave editing capabilities as other systems.   I am trying to minimize the number of software packages I use and the expense while getting as much functionality as possible.  SONAR has a lot of functionality, and for me, special things including 64 bit mix engine and importing DSD files that are important for my mostly classical music work.   The recent offer of lifetime updates was the final thing that swayed me to choose it.   Frankly, I am still a bit disappointed that SONAR, which advertises CD burning as a feature, does not have the capability I was expecting.  This is especially true since Cakewalk up until a few months ago used to sell a separate program that provided that specific function (much like HOFA CD Burn), but it was discontinued.   Anyway, I appreciate all the suggestions offered.  

Yes, Atsuko is spot on the money.
 
I also hit T where I want a track break to occur and CDA is powerful enough to add silence if you so wish before the next song plays. It just pads the beginning with silence.
 
If burning a live performance with clapping & ambience in between each song, you wouldn't bother with this setting.
 
The same applies if you're sequencing an album where songs segue into each other, much like I'm currently doing.
 
You can also zoom in really closely and insert your marker so that it's right on a zero crossing, so selecting this track to play doesn't start with a loud pop!