I was going to say that you could enter a few events, export your database, find the entries that you just did and find the commonality between them, and then simply replicate the lines... but since you're using the flat-file, you don't even need to export anything.
I would suggest that you create a new file for this test. Then enter you first three events or so, just enough to figure out the pattern. If I remember correctly, each event is separated by a -||- (dash, pipe, pipe, dash) and each field is separated by a | (pipe).
Once you find the pattern, then you just need to repeat the same lines over and over. You'd need to change the date value (you can use the php function gregoriantojd for help on that one) and the price for each event, but pretty much everything else should stay the same.
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