What's meant to happen:
Parliament operates for a year then gets prorogued for a week or so to start a new session with a new Queen's Speech setting out the plans for the next year.
The Queen doesn't come in person so five Lords (leader of house, a Conservative, Labour head, Lib Dem head, Crossbench aka independents head) act as a Commission to represent her and close the session, with a busy chamber of Lords hanging round to watch,
They send Black Rod to the Commons to ask MPs, lead by the Speaker, to come to the Lords for the closing ceremony. When its done the MPs go back to the Commons, the Speaker says "Queen says we're done here, guys", MPs shake his hand, everyone goes home.
What actually happened:
Parliament was planned to run for two years to leave enough time to sort out Brexit. (Normally laws in progress get ditched at the end of the session and you have to start again.) After two years May isn't 100% certain she'd actually get a new Queen's Speech passed, which normally means it's curtains, so she stalls, during which time she's replaced.
Johnson prorogues for five weeks, very blatantly to reduce time for MPs to block a no deal Brexit, which doesn't exactly work.
Only three of the Lords on the Royal Commission turn up as the Labour and Lib Dem heads boycott it. Fortunately for protocol, three is the minimum needed for it to be legit.
Literally nobody is on the opposition benches in the Lords and there's about a dozen on the government side.
Black Rod goes to the Commons and asks the MPs to come to the Lords, prompting loud shouts of refusal.
Several MPs grab hold of the Speaker, leading to scuffles with clerks of the house. It was a protest recreating when King Charles 1st prorogued Parliament for 11 years (which sparked the Civil War.) MPs at that time sat on the Speaker so he couldn't go to the Prorogument ceremony for several hours, during which time MPs tried to pass various laws (which didn't have any force.)
Other MPs hold up signs saying "Silenced."
While Black Rod looks very pissed off, the Speaker pretty much says "This proguement isn't normal, it's political bullshit, I'm only going to the Lords now because it's my job." Various Tory MPs shout that he shouldn't be doing this and he basically tells them to get fucked.
The Speaker leads most but not all Tory MPs (plus the DUP) to the Lords while all the other MPs chant "Shame on you!" The opposition MPs stay in the Commons during the prorogument ceremony and sing socialist/Scottish anthems.
The Speaker comes back from the ceremony to do the goodbye bit, but all the Tory MPs who went to the Lords go home instead.