I believe both of those tabs are reliant on three things:
1) The location of your current session (i.e. selecting what city you're in)
2) The location of the venue of the shows
3) The start and end date of a run of a show
I've yet to run into this issue with creating new shows, so be sure to double-check your events' information
Looking at the "snark" show you mentioned, it has only one date - perhaps there was a mistake in entering the information for that. Your "SARAH" show was a while ago, so it won't appear, as it's over a year old.