Emailing dynamic form fields

I am trying to get user friendly form labels to be emailed when a user registers for an event using my online entry form. When I modified the labels as follows the amounts are submitted via the email but NOT to the database.
<label class="checklabel" for="H1C1Th5D20"><input type="checkbox" name="Thursday 5D $20" id="H1C1Th5D20" value="20" class="formCheckboxField_Standard eventClassCheckbox" <?php if (!(strcmp((isset($_GET["invalid"])?ValidatedField("EventEntryinsert","H1C1Th5D20"):""),"1"))) {echo "checked=\"checked\"";} ?> tabindex="3">
&nbsp;Thursday 5D $20</label>

I have zipped the entry form, the email that was sent to me and the webassist/email folder

EventEntry_insert.php

this:
name="Thursday 5D $20"


is not a valid form field name.

you cannot use spaces or special characters in a form filed name. form filed names can contain only letters and numbers. The first character must be a letter. the only exception is an underscore.