Somebody who is obligated to keep Shushan-Purim (on 15th Adar); must they eat the Seudat Purim in a location where Shushan Purim is being celebrated?
In other words, on Shushan Purim, can a Yerushalmi go eat his Purim Seuda in Netanya?
I can't think of a reason why not, since the Seuda is an obligation on the person, not on the location. Yet I cannot find anybody who specifically mentions it. (I've searched the Shulchan Aruch, Kitzur SA, Aruch HaShulchan, Kitzur Yalkut Yosef.)
However, somebody mentioned that maybe there's a lack of Simchat Purim if it's not Purim.
The same question & answer would apply to Mishloach Manot and Matanot L'Evyanim, I assume.
For Megilla reading it seems clear in Halacha (סימן תרפח:ה ) that you read in the location you are in:
בֶּן עִיר שֶׁהָלַךְ לַכְּרַךְ, אוֹ בֶּן כְּרַךְ שֶׁהָלַךְ לָעִיר, אִם הָיָה דַּעְתּוֹ לַחֲזֹר לִמְקוֹמוֹ בִּזְמַן קְרִיאָה (שֶׁל י''ד) וְנִתְעַכֵּב וְלֹא חָזַר, קוֹרֵא בִּמְקוֹמוֹ; וְאִם לֹא הָיָה בְּדַעְתּוֹ לַחֲזֹר אֶלָּא לְאַחַר זְמַן הַקְּרִיאָה, קוֹרֵא עִם אַנְשֵׁי הַמָּקוֹם שֶׁהוּא שָׁם
I'm looking for a source, either way, or else for a good reason why the Yerushalmi should have his feast in a walled city.