Tickets to the Mass were given to each parish for a distribution, so they are probably next to impossible to come by at this point. Your best bet is to watch the motorcade in the side of the road. Not much more than that. Sorry.
You would not be able to see the Pope address Congress (it will be broadcast on a screen outside) but the Pope expressed interest in making a brief public appearance at the West front of the Capitol. Contact your congressman from the House of Representatives to see if there are any tickets available for the outside event.
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