I know this is right but, it says:
Undetermined object at Column 1 Line 217
Here's the command:
/tellraw @p ["",{"text":"[","color":"white"},{"text":"Gateman","color":"dark_aqua"},{"text":"]","color":"white"},{"text":" You need $5 to enter the town.","color":"dark_aqua"},{"text":" >>>","color":"white","clickEvent":{"action":"run_command","value":"/setblock 3.5 100 -16.5 minecraft:redstone_block}]