Improvements for Events section

[bernhold]

Feedback from @jlcohoon

• change the date format to improve hierarchy, emphasis, and alignment (see image—top is suggested format, bottom is current)

• add info at the top of the page on how to get your event added (maybe this is a future task?)
• add times to upcoming events list
• add registration link to upcoming events list
• if possible, make the series clickable so that you could view all HPC Best Practices Webinars, for example
• In the event listing, the title block is too far left and doesn't line up with most of the rest of the listing. This appears to be happening when the title wraps to a second line.
• Re:big events, I would consider a conference to be a single event and there can be a schedule/more info on the individual event page
• mobile formatting of the event list also needs work (subsumes Issued with event section formatting on mobile #193). This is just because the way I specified the width of the date block doesn't scale properly with the size taken up by the date.
• Add location info to event collection listing
• Maybe add ability to select by location (maybe online-only vs hybrid vs physical-only?)