The app still has lots of potential.
1st - use the user’s iOS settings for font sizing. At the very least allow manual scaling of fonts wherever possible.
2nd - Get rid of light grey fonts on white background. When used with small fonts, it is exceedingly difficult to read.
3rd - in general, users ought to be able to organize (not filter) by groupings: e.g., track, speaker, & room. The user ought to be able to select and add, either individually or wholly, items in the group.
Keep making it better!