I've got a few questions.
1. I've been interested in picking up solar viewing with this telescope. In the past I've used 8x8 sheets of white light filters that were a pain to work with. They barely fit the aperture of the telescope and I had to tape it to the telescope. is there another, easier way of attaching white light solar filter film to this telescope?
2. Alternatively, are there any cheap H-alpha filters that I can attach to this telescope?
3. Other than sunspots, what cool stuff can I show off at star parties/outreach events? In the past, all I've seen is a featureless yellow circle. I know the sun is headed towards a minimum in its cycle. A quick google search has given me granulation and faculae. Granulation I know to be the "texture" of the sun so I can explain it that way, and faculae are white smudges. How often are faculae visible? Is there anything else I'm missing?
4. Lastly, while unrelated, I've been using milk crates as my "mount" for this telescope but it's annoying to lug them all with me whenever I take my telescope somewhere. Is there a lightweight/compact mount that's affordable (<$100) that I can use for this telescope that's not a tabletop mount (I.e. a tripod)?
I have to agree with CB that, at least for now, a white light filter isn't going to reward you much. The Sun was completely blank a week ago when I viewed it with a 12-inch f/150 tower telescope. There's a tiny spot now but you probably wouldn't see it with the OneSky. As we get closer to sunspot maximum there will be activity to show that will make it worthwhile.
"cheap" and "H-alpha filters" don't belong in the same sentence, unfortunately. The H-alpha scopes that CB suggests are really the best solution. I don't think you can get a separate H-alpha filter for the price of those complete scopes, and the set-up and use of them will be a real hassle. Reflectors like the OneSky with a central obstruction (the secondary mirror) require masking all but an open part of the aperture, which really needs to be done with a filter at the eyepiece end anyway to increase the focal ratio, and tuning the filter on the front or rear. If that those ideas don't have any real meaning to you at this point, know that there would be even more to learn and do. The small H-alpha scopes are wonderful performers for the price, something that seemed impossible not that long ago.
What you'd get in H-alpha will include features that appear in the Sun's chromosphere that can be seen more readily than in the photosphere in white light. You're not going to see granulation -- that requires a big specialized solar telescope -- but faculae and more can be seen. The real crowd-pleaser is prominences, which can be seen off the edge of the disk. They're visible on the face as well (darker features called filaments) but they're much cooler (so to speak) when seen off the edge. With so little solar activity these days you're not going to see that much even in H-alpha but there's always something.
I see you're in LA. Go to Griffith Observatory during the day and you can see the Sun in both white light and Ha-alpha in real time. There are plenty of online sources for images as well.
The other problem with the OneSky as a solar telescope is that the tube is open. You can easily cover the end of the telescope with a sheet of filter material but I'd want to make a shroud or something to cover the open part of the tube. I'm pretty sure the focused image can't get out of the tube but someone could stick their hand inside. As for ready-made filters, there are plenty that fit over the front of a normal telescope tube but the front end of the OneSky isn't round. There's a filter that goes on the inside that would work but it's really expensive. Making one from a sheet of filter material isn't that hard to do, though.