I think the biggest issue in playing along in a bluegrass jam is if they change keys frequently. Assuming you don't play other instruments as well, you may opt to bring two dulcimers- one for the keys of G and A, and another for the keys of C and D. That's what i used to do for oldtime music jams. It's not hard to tune up or down by one step to do this, OR use a capo on fret1 to do it. (I used to just tune up and down between A&G, and between D&C.) Using one dulcimer and tuning up and down over multiple steps will more quickly result in breaking strings, IMHO.
Bluegrass jamming has a lot more singing though, and often the favored singing key is B-flat, which might pose a special problem for a dulcimer player. In that case you might try completely muting your strings with the left hand while strumming in a percussive way with your right hand pick... not making out-of-tune notes but instead still having fun while improving your strumming rhythm.
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updated by @strumelia: 01/22/25 11:20:47AM