It really depends upon the card game that is being played if it is "open" to walk ins. I can speak to Texas Holdem and poker..
For example if you play Texas Holem (tournament style), we can normally handle 12 at a table but we "normally" have chips to accomodate 24 if necessary. Our game never has more than 24 players although I do know of other Texas holem games that welcome all players. In our game there is a priority list to play, with people that support the game every week getting first crack to play. If spots remain before the game starts then others are invitied to play. Once the game has started no additonal buy-ins are allowed.
However with regular poker where you can play with no more than 7 people at a table, most of those games are pre-arranged..and besides that you really need to know what type of game you are asking to play in...by that I mean table limits. If a seat is open at the start of the game and someone asks to join in, we have always welcomed walk-ins to play with us ...but again as long as they understand the game being played and the table limits allowed.
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