A5     - Janusz, SP9FIH and Leszek, SP6CIK will be active from Bhutan as A52P and A52CI, respectively, from 19 April to 4 May. They will operate SSB, CW  and digital modes on 40-6 metres. Their QTH is located at about 3000 metres a.s.l., with a good short path opening to North America, Europe and Japan. QSLs via Club Log's OQRS. See https://a5.dxpeditions.org for more information.

A6     - In recognition  of  World Amateur Radio Day,  the  Emirates Amateur Radio Society  will  operate  special  callsign  A60WARD  (QSL  via EA7FTR) between 15 and 24 April. Also expect activity by A60WARD/0, A60WARD/1, etc.  (see  https://www.qrz.com/db/A60WARD  for the  QSL routes for the various suffix extensions)

CN     - To celebrate  World Amateur Radio Day  and the 99th anniversary  of the founding of the IARU, special callsign CN99HR will be active on 13-21 April. QSL direct to CN8RAH.

F      - Dominique, F5PTI will be active as TM500NA on 14-28 April  to memorialize the  500th anniversary  since the first  European explorer, Giovanni da Verrazzano,  visited  nowadays New York City  area  and named it New Angouleme. QSL via F5PTI.

F      - Special callsign TM83JO will be active for fifteen days between 16 April, when the Olympic flame is lit in Greece,  and 26 July,  when the flame ends its journey by lighting the Olympic cauldron  at the Paris 2024 Opening Ceremony of.  Look for activity  on  80-6 metres SSB, CW  and digital  modes,  as well as via  QO-100.  QSL via  the bureau, LoTW, eQSL.

JD1_oga- Kou, JP1IHD will be active again as JD1BQP from Chichijima (AS-031) Ogasawara from 22 April to 3 May.  He plans to operate SSB  on 15-6 metres. QSL via the bureau to JD1BQP, or direct to JP1IHD;  he will upload his log to LoTW and Club Log.
Also look for Harry, JG7PSJ to be active again as  JD1BMH  from the same island from  22 April to 4 May.  He will operate  CW, SSB  and  RTTY on 40-10 metres. QSL via JD1BMH (bureau), or direct to JG7PSJ. Logsearch  on  http://jg7psj.starfree.jp/jd1bmh/.  He does not  use LoTW or PayPal

OE     - In celebration of the 150th anniversary  of the birth of  Guglielmo Marconi (25 April 1874), Enrico, OE7AFT (IZ4AFL)  will be active as OE150GM on 19-28 April.  He will operate CW only. QSL via LoTW,  or direct to OE7AFT ("neither SASE nor USD/EUR required").

PJ4    - "TJ", PE1OJR will be active again as PJ4TB from Bonaire (SA-006) on 13-28 April.  He will operate SSB, FT8 and FT4 on 40-6 metres.  QSL via LoTW. [TNX NG3K]

SV     - Celebrating the 100th anniversary of the  Second Hellenic Republic,  several operators will be active as SX100D on 13-21 April. Look for activity on 160-2 metres  SSB, CW and digital modes.  QSL via LoTW, eQSL, Club Log's OQRS,  or direct to SV2GWY.  A certificate will be available for download on https://sv2rck.gr/SX100D/.

T8     - Nobu, JA0JHQ  will be active again as  T88PB  from  Koror (OC-009), Palau on 12-15 April,  with main activity during the  CW leg of the Japan International DX Contest (from 7 UTC on 13 April to 13 UTC on 14 April, http://jidx.org/). QSL via LoTW (preferred), or direct to JA0JHQ.

YU     - Organised radio amateurism in Serbia began with the founding of the "Society of Friends of Radio-Telegraphy and Radio-Telephony"  on 15 July 1924 in Belgrade.  Celebrating 100 years of  Amateur Radio  in the region,  the  Amateur Radio Union of Serbia  (YU1SRS)  will  be active as YT100R and YU100R from 1 April to 1 December.  A certificate will be available: https://www.radiosport.yu1srs.org.rs/.