How fast are your loom warping skills?
I don’t see a way to combine the two warps with the differences in colors & sizes. Instructors usually have good reasons for specifying specific colors. You probably do need the wider warp for the clasped weft class. They also know how weaving conferences work.
So …. Two ideas …
1. Contact your second instructor by email and find out if there’s any way to use your first class warp for the clasped warp workshop. You’d have to add on about 3 yards.
2. Create a second warp and put on the loom in the evening after the first class ends.
I’d probably create two warps. It makes for a long day because, after weaving for two full days, you’ll have to beam a warp, thread heddles, & sley a reed so that you’re ready for your second class. Rose path is an easy predictable threading so that makes it a bit easier and 10/2 cotton is a fairly easy warp. I’d take a clip-on light as hotel/dormitory room lighting isn’t great for seeing slots in a reed in the evening.
Something else you could do to make this more manageable is to do the second warping as a front to back process with a second reed, if you have one. You’d be able to thread the second warp thru the reed at home (tying it off into bundles) so that it would be all ready for a front to back warping on the second evening. That would save you some time. But I’d recommend not doing a front to back warping for the first time at a conference.
I’m not sure I’d use a second reed if I were traveling by airplane as I don’t know how I’d pack a second reed. But if you’re driving, that’s not a problem. Note that large weaving conferences do often have some evening activities and weaving all day can be hard on your body.
Conferences are places where you can meet lots of knowledgeable weaving friends if you get stuck. Have fun!