You can make the puris and chutneys the before day . Once that is ready all others can be done a while before assembling. Enjoy this easy and yummy chat at home.
I take the short route of buying the dates chutney ready made these days ;) It is called bhel puri chutneys and stays well for long when refrigerated. I use even for sandwiches - its tangy, sweet, spicy with all the flavours bursting out....hmmm yummmy!