Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
2012 in Maximum Fighting Championship
Table title:
List of events
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Event </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > City </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > MFC 32 - Bitter Rivals </td><td class="highlighted"  colspan=1 rowspan=1 > January 27, 2012 </td><td class="highlighted"  colspan=1 rowspan=1 > Mayfield Inn Trade and Conference Centre </td><td class="highlighted"  colspan=1 rowspan=1 > Edmonton, Alberta, Canada </td></tr>
<tr> <td colspan=1 rowspan=1 > MFC 33 - Collision Course </td><td colspan=1 rowspan=1 > May 4, 2012 </td><td colspan=1 rowspan=1 > Mayfield Inn Trade and Conference Centre </td><td colspan=1 rowspan=1 > Edmonton, Alberta, Canada </td></tr>
<tr> <td colspan=1 rowspan=1 > MFC 34 - Total Recall </td><td colspan=1 rowspan=1 > August 10, 2012 </td><td colspan=1 rowspan=1 > Mayfield Inn Trade and Conference Centre </td><td colspan=1 rowspan=1 > Edmonton, Alberta, Canada </td></tr>
<tr> <td colspan=1 rowspan=1 > MFC 35 - Explosive Encounter </td><td colspan=1 rowspan=1 > October 26, 2012 </td><td colspan=1 rowspan=1 > Mayfield Inn Trade and Conference Centre </td><td colspan=1 rowspan=1 > Edmonton, Alberta, Canada </td></tr>
</table>
Question:
What events were held at the Mayfield Inn Trade and Conference Centre before June 1, 2012?
Answer:
MFC 32 - Bitter Rivals and MFC 33 - Collision Course were held before June 1, 2012 at the Mayfield Inn Trade and Conference Centre in Edmonton, Alberta.