Stardew Valley's multiplayer mode normally only allows four farmers to join a server, but the Unlimited Player Mod removes this restriction entirely and lets you play with as many friends as you like. Here's how to download and install the mod.
A mod for every skill in Stardew Valley
In order to install the Unlimited Player Mod for Stardew Valley, you will first need to have SMAPI installed and working. This is essentially the hub for all of your Stardew Mods and what makes them work in the game. Follow these steps to install it:
Open the provided config file in the Unlimited Player Mod folder. Here you can set the limit for the number of players that can join your game.
Only the server owner needs to have the mod active to make it work for all players. You can remove the hut limit, player limit, player network limit and get various information about players while using the mode.