We won't see Stephen Strasburg on the mound until the very end of the season, if we see him this year at all. Bryce Harper will start the year in Class-A Hagerstown, and probably won't make his way up to the MLB roster this year. Basically, it could be a little while until we see the future core of the Nationals on the same lineup card.
↵That's why I'm encouraging you to check out Nats Fest on Wednesday, which according to Dan Steinberg of D.C. Sports Bog, will feature both players.
↵↵↵As for the event, it costs $5 for kids and $10 for adults, and will include an hour-long practice, Q&A sessions, hand shakes, live music, giveaways and the entire opening day roster.
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Strasburg obviously won't be participating in that practice, and there is no word if Harper will take part, but it will still be fun to see them at Nationals Park together. Check out the Nationals ticketing site for more on the event, and how you can attend.