we don't use index cards but i use 8.5 x 11 and laminate it. i print the itinerary on one side of the page and the events on the other. i punch a hole in the laminate and hang it from our stroller. i have the entire trip in a single snapshot. the budget sheet stays folded up in our wallets
they are done in Excel. i am more than glad to email the file to anyone who wishes. send me a PM as i am more likely to check PM's than return to this thread