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:
Sea Star Festival
Table title:
Festival by year
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Dates </th><th colspan=1 rowspan=1 > Attendance </th><th colspan=1 rowspan=1 > Headliners </th><th colspan=1 rowspan=1 > Notable acts </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2017 </td><td class="highlighted"  colspan=1 rowspan=1 > 25–28 May </td><td class="highlighted"  colspan=1 rowspan=1 > 50,000 </td><td colspan=1 rowspan=1 > The Prodigy · Paul Kalkbrenner · Fatboy Slim </td><td colspan=1 rowspan=1 > Dubioza kolektiv, Mahmut Orhan, Modestep, Pendulum, Rambo Amadeus, SARS, Spiller, Umek, Bad Copy, Pips, Chips & Videoclips </td></tr>
<tr> <td colspan=1 rowspan=1 > 2018 </td><td colspan=1 rowspan=1 > 24–27 May </td><td colspan=1 rowspan=1 > 35,000 </td><td colspan=1 rowspan=1 > Dimitri Vegas & Like Mike · Hurts · Robin Schulz · Paul Van Dyk </td><td colspan=1 rowspan=1 > Filatov & Karas, Luke Slater, Ofenbach, Tram 11, Edo Maajka & Bend </td></tr>
<tr> <td colspan=1 rowspan=1 > 2019 </td><td colspan=1 rowspan=1 > 23–26 May </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > Wu-Tang Clan · Sven Väth · Nina Kraviz </td><td colspan=1 rowspan=1 > Hladno Pivo, Bajaga i Instruktori, Mahmut Orhan, DJ Jock </td></tr>
</table>
Question:
When was the 2017 Sea Star festival, and how many attended?
Answer:
Sea Star Festival took place May 25–28, 2017 and was attended by 50,000 people.