[Avodah] heard re: negotiations on shabbas

[Harvey Benton]

hear from someone that shidduch financial arrangements (in details) are allowed on 
shabbas? 
is this true? if so why? (and why not for other "mitzvot" like building a house (hachnasas
orchim), or lulav etrog (midoraisa) or tefilling/mezuzos, etc?
also.....
why is selling aliyas, petichat haaron (yom kipuur rosh hashanna,etc) ok??
(tzarchei tzibur (unless going to the rabbi (in particular) v. 

mecz
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