Verbseoul.
하다 verb
개장하다gaejanghadato open (a location, session, etc.)

To say to open (a location, session, etc.) politely in the present tense, use 개장해요 (gae-chahng-hae-yoh). Below is the full conjugation of 개장하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
개장해
gae-chahng-hae
개장해요
gae-chahng-hae-yoh
개장합니다
gae-chahng-hahm-nee-dah
Past
개장했어
gae-chahng-hae-ssuh
개장했어요
gae-chahng-hae-ssuh-yoh
개장했습니다
gae-chahng-hae-sseum-nee-dah
Future
개장할 거야
gae-chahng-hahl- -guh-yah
개장할 거예요
gae-chahng-hahl- -guh-yae-yoh
개장할 겁니다
gae-chahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
개장하세요
gae-chahng-hah-sae-yoh
Suggestion / Let's Polite (요)
개장해요
gae-chahng-hae-yoh
Question Polite (요)
개장해요?
gae-chahng-hae-yoh-?
Connective “and” — (고)
개장하고
gae-chahng-hah-goh
Conditional “if” — (면)
개장하면
gae-chahng-hah-myuhn
Noun form — (기)
개장함
gae-chahng-hahm