Hi!
Omar XE1AO sent me an e-mail, mentioning that he will be operating as XE719SEP on the satellites on 19-20 September 2015. XE719SEP is a special-event station commemorating the earthquakes that hit Mexico City on those dates in 1985. The "719" in the call sign represents the local time of the first earthquake, 7.19am on 19 September 1985. Officially, the XE719SEP stations will operate until 0040 UTC on 21 September, corresponding to 7.40pm local time on 20 September 1985 - the time of the second massive earthquake.
Other operators will use XE719SEP on other bands and modes during this weekend. More information about XE719SEP, in English and Spanish, is available at:
Another page has similar information in Spanish:
A chart with a schedule showing when and where other stations will operate as XE719SEP is at:
http://rne.puebladx.org/RNE/SEP19.html
The "XE Time" in this chart is the same as Central Daylight Time in the USA and Canada, corresponding to UTC -5.
Good luck, and 73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK