See my comments about creating additional tables in http://www.sfu.ca/biology/facilities/computer/calendar/tables.my.sql.txt so you can have different administrators and different websites.

1: science_fraser% mysql -u mysql_username -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8092531 to server version: 4.0.20-standard-log

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> use mysql_database;
Database changed
mysql> SELECT * from mrbs_repeat
    -> ;
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+
| id | start_time | end_time   | rep_type | end_date   | rep_opt | room_id | timestamp      | create_by | name            | type | description | rep_num_weeks | private |
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+
|  1 | 1170946800 | 1170990000 |        2 | 1199088000 | 0000110 |       1 | 20070208162035 | dsandher  | No appointments | I    | NULL        |          NULL |       0 |
|  8 | 1243292400 | 1243294200 |        2 | 1261785600 | 0011100 |       1 | 20090520121422 | carmean   | end of Day      | I    | NULL        |          NULL |       1 |
|  9 | 1243018800 | 1243022400 |        2 | 1261684800 | 0011100 |       1 | 20090520165852 | carmean   | Lunchtime       | I    | NULL        |          NULL |       1 |
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+
3 rows in set (0.22 sec)

mysql> alter table mrbs_repeat add column student_id int;
Query OK, 3 rows affected (0.78 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> SELECT * from mrbs_repeat;
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+------------+
| id | start_time | end_time   | rep_type | end_date   | rep_opt | room_id | timestamp      | create_by | name            | type | description | rep_num_weeks | private | student_id |
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+------------+
|  1 | 1170946800 | 1170990000 |        2 | 1199088000 | 0000110 |       1 | 20070208162035 | dsandher  | No appointments | I    | NULL        |          NULL |       0 |   NULL     |
|  8 | 1243292400 | 1243294200 |        2 | 1261785600 | 0011100 |       1 | 20090520121422 | carmean   | end of Day      | I    | NULL        |          NULL |       1 |   NULL     |
|  9 | 1243018800 | 1243022400 |        2 | 1261684800 | 0011100 |       1 | 20090520165852 | carmean   | Lunchtime       | I    | NULL        |          NULL |       1 |   NULL     |
+----+------------+------------+----------+------------+---------+---------+----------------+-----------+-----------------+------+-------------+---------------+---------+------------+
3 rows in set (0.01 sec)