If you can pattern where they will go after fly down to feed or strut, sit between the roost and the place they want to go. Sometimes this isn't possible.
As tomanyturkeycalls said, it depends on terrain and cover. If the gobblers are with hens immediately after fly down, use some very soft purrs and scratching. Many times the gobblers will note where a hen sound (you) is, and will come courting after the real hens leave.
Patience and be as still as possible. This may take some hours. Also, watch out for gobblers coming in silent. Hens may come to you in order to check out the new voice in the woods, so keep still.
Roosted birds have animals walking under them all night long. If you accidentally walk under them again (we've all done it, knowingly or unknowningly), don't stop to look. Just keep walking and devise a plan.