Had this more often, so from personal experience:
-Attending Saturday Evening is ok, and is the same like a Sunday Mass.
-Check out which diocese it is. Maybe the diocesan website has a schedule of where local Masses are.
-Otherwise search for something like “Catholic Seattle” (depending on the place you’ll visit) - just combining “catholic” and the name of the place into a search engine gave me a lot of results in the past. Otherwise also use “Parish Seattle” or “Saint Seattle” could give some results of parish websites with their Mass times-schedule
-I’m willing to help you search a Catholic mass in the neighborhood, somehow I developed a talent to see places and logistical solutions. You can send me a PM with some geographic details and I can help.
-Find out if you can combine a visit to a Mass with your trip to/from your destination, or if you can find a way to get there by bus, train or so (www.rome2rio.com comes to mind)
-Ask the people you’re visiting if they could take you. If they understand it’s important and whether they are active in their faith or no, they might be willing to bring you (maybe on their road to groceries-shopping for your visit so they can shop whilst you are in Mass)
-Anyway, explain your dilemma to the hosts - God knows they are more willing to accomodate than you think.
-Maybe a nice thing to find a beautiful church or a nice city/town, where you can attend Mass and your friends can see the church or its surroundings.
-Once you know you did your best to find a solution but have no way of attending Mass:
-Think again (seriously) if you really want to go to the trip. Probably yes, but I don’t know.
-One of my reasons to still go, would be that I would offend a host too much by cancelling and that it carries some witness to be close to these people. But I would always say during my visit “Normally I’d go to Mass on a Sunday” so they know your actual priorities on the Lord’s Day.
-If it’d just be for my own enjoyment, I’d stay home or come later after I visited my Mass.
If you can’t go to Mass and have decided to go the visit:
-Make sure you take a prayer book with you and the readings for that Sunday
-Check out, and take with you, some prayers/ a rite for ‘Spiritual Communion’. I know there are prayers expressing your desire to attend but also your inability to go, and to offer that up to the Lord as a suffering.
-Talk with a priest afterward (or if possible beforehand)
-Go to a weekday Mass the week before or the week after the visit.