Here is some grammatically bad advice, based on experience and observations from somebody who has clambered onto the stage all throughout Morrissey’s solo career.
If you have the desire to do this, I assume and hope it is because of a love towards Morrissey. Therefore you would not want to do anything to upset or hurt him in any way. That would include upsetting any of the band, the crew, his staff or his fans. The following may help you to achieve your obligatory pilgrimage in the best way possible. This is in no way an exclusive list, only a guide.
It isn't like a Cud or Nirvana gig. It isn't even like a Smith's concert (So I've heard). Morrissey is older. We are older. There is order. Even the tearing of his shirts are becoming more orderly. We still haven't got to the stage (very often) where the person who catches it, keeps it. At venues where little or no efort is required. I.e. No mosh pit. The concert would be chaos in no time if everybody got on stage. So sometimes it would be selfish to do so. These forecoming concerts are in venues that are perfect game.
Do make the effort to do so. It will please Morrissey.
Don't go to early. If you do, your show will be over early.
Don't try to time it for a certain song or part of the show. Take your chance when you have it. You may never get another.
If you wait until the final song(s) you may not get a chance and the show, along with your chance will be over.
Don't be fixated about doing it. Take your chance if it comes. Enjoy the show. It isn't everyday you get to hear and see Moz.
Consider using a fellow apostle or two as a decoy. They will also tie up security, which may aid you in attaining your goal.
If you fail in your attempt, you may help somebody else. At least your tried and the effort will be appreciated.
Maybe the people around you may help by giving you some space or help in some way. Ask nicely. Accept their response.
Do not attempt to do so if you are drunk or high on drugs as your judgement is impaired and you may do something you will regret or be punished for.
Do not spoil the show for others in the way that you get from the crowd to Morrissey.
Do not hurt anybody in the process. Everybody there are apostles too and some have practically camped out all night to get near the front. They don't deserve your boot in their face and may want to return the favour if you do.
Don't crowd surf. Even if it is possible, it is not a way to the stage and annoys many people. Your likely to hurt a few too.
Do not rush to Morrissey. By the time you reach him you will have to have slowed down to a walking speed, or you will be carted away before you reach him. Worse still you may accidentally hurt him.
Do not resist security when you are caught on stage. If you do, you may be thrown out altogether and perhaps not very gently. If you do give in to them, they may let you shake his hand.
If you do reach him, do not prevent him from singing or hold onto or manhandle him.
Do not pull him. Even gently. This goes for if you are shaking his hand from the crowd too. If you love him, you will understand everybody doing that to him all adds up to hurting him. Do you want that? Try not to get carried away with emotion and forget this.
If others are already on the stage, wait, don't crowd the stage. That's just dangerous and security need to diffuse the situation before the concert can continue.
Remember security are only doing their job to protect Morrissey, the band, the audience and the equipment. They will not deliberately hurt you. Don't hurt or fight them. The vast majority of the security will only do what they have to. Some of security in the pit and almost all on the stage work for Morrissey and maybe even love him as much as you. They are aware this goes on at Morrissey concerts and they do a good job of policeing it.
Try to ensure that you don't appear to be a threat to hurting anyone or spoiling the show. They may even let you achieve your goal.
Remember that on stage there is a lot of equipment and much of it isn't easy to see. You need to ensure that you don't interfere in any way with any cables, pedals, leads, monitors or speakers, etc. You could spoil the show. Can you imagine how pissed with you Morrissey, the band, the crew and everyone in the building would be?
Having got a cuddle, kiss or shake of the hand from Morrissey. Leave and head back to where you came, or the side of the stage. Security will more than likely escort you. If you did it the way I've suggested, they may even let you return to the concert to enjoy the rest of the show. If they don't, accept you took a risk. Be happy to have done what many can only dream of and leave acceptingly without resistance.
Good luck!