Give out all the best loot in the first 20 minutes. You beat a boss at the end of a session? "Alright, we'll go over the loot beginning of next session"
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Give them an earlier time. If they find out that they're given an earlier time and get salty about it, they have bigger problems.
Tell them their own seperate start time 30 minutes before the others?
We do that for my inlaws. Our wedding invitations had one start time for my family, and another start time an hour earlier for my in-laws. Everyone showed up at the same time.
I do this with my son. He is always late.
Sit them down like an adult and tell them that wasting 20-30 mins of 5 of your closest friends time every week isn't a good quality.
Give their character a disease where they take damage every 10 minutes the player is absent without notice
Give them an in-game condition that causes them to go catatonic periodically, and now the other players have to deal with the dead weight player character until the player shows up.
Why would you make your other friends suffer because of one asshole? That one guy showed up late? Sorry, we've already started, and the party left you as you didn't show signs of life. Roll a new character in the meantime.
My grandmother would tell each of her grown adult children a different time to show up in order to get everyone there on time.
Funny story: because I was always late, my old group started giving me earlier times to show up. Because these times aligned better with my trains and subways, I started showing up on time. Except they'd lied to me going my being late would actually make me arrive at the same time as everyone else. But now I was half an hour early and they were unprepared.
If you can't align your trains and subways with your agreed upon time, you still need to take the earlier train and be there 30 minutes earlier. That's just how it works. You take the transport that gets you there before the time, not what gets you there closer to but after the time.
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No, they’re correct. People need to be more respectful of others, especially when it comes to things with hard start times like D&D, a concert, etc.
Depends on the friend group, honestly. I can see scenarios where people aren't ready to have guests half an hour earlier than expected.
Though, this is why communication is important; if you ask the host if 30 minutes early is preferable to 15 minutes late, you'll get the answer that works for them.
Depends on the culture.
You're right that it does, but it should not.
That's just your cultural preference shining through.
Only tell that player that the game starts at 6pm instead of 7pm, everyone else tell that it starts at 7pm. If they are half an hour "late" they will finally be the one waiting for the others to finally show up.
Just start the game on time without them? They can hop in when they arrive.
Make their PC cursed with a broken Blink spell. They random pop into and out of existence. DC 12 for staying in this plane.