I have the following CSV
Date,Event,Description
24/01/2010,Football,Football practice for all Years.
24/01/2010,Cricket,Cricket Practice for all Years.
25/01/201
There are pretty much many ways to read a CSV files; you can also read in line by line and use the split function to separate each filed as an element in an array.
If search speed and complexity is not a concern, you can do a linear iteration and check for dates. You may want to use strtotime to convert the date into a unix timestamp for comparison.
If the search speed is important, then convert the date to timestamp, have an associative array which key is the timestamp (essentially a hash table)
To get tomorrow's date, check out the date function documentation in the PHP manual.